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The function of the endocrine system is to produce hormones otherwise known as chemical substances that regulate the growth of cells in the human body. These cells determine the body's growth rate, metabolism, and its sexual development rate.

Hormones are chemical messages that are secreted directly into the blood stream so that they can travel to specific areas of the body.

These hormones can cause a change in the development and growth of people, a change in the metabolism rate, a change in sexual development, a difference in mood, and a change in body temperature and thirst.

Positive feed back is when one of your systems needs to “pick up the pace” and continue working. This feedback will continue to occur until a negative feedback shows up, slowing down the organ.

Some examples of positive feedback is when a mother gives birth and when blood begins to clot.

Negative feedback is when your systems need to slow down what it is currently doing or completely stop that action.

Some examples of negative feedback is a home thermostat. This is a good example because it demonstrates how one thing stops working if necessary.

The pituitary gland has the job of regulating the hormones that are sent into the body.

The hypothalamus is in charge of regulating the metabolism and body temperature of a person.

The thyroid gland also regulates the growth of the brain and nervous system.

The parathyroid glands are two glands that regulate the amount of calcium in the blood system and bone.

The adrenal glans create the hormone known as adrenaline that helps the body endure both physical and mental stress.

The pineal body regulates the cycle of time at which your body wakes up.

The reproductive glands are responsible for producing sperm for males and ovaries for females.

The endocrine system produces hormones that can affect other systems in the body.

The hormones created in the endocrine system can control the growth rate of bones in the skeletal system by either giving it the necessary amount for healthy development or a deficiency of the necessary nutrient required for bone growth.

The hormones created here can control the rate at which the brain cells function and mature.

In the womb, the amount of hormones, can affect the brains mentality on whether it is a male or female.

The more testosterone that can be created at that young age determines whether the baby will have a brain with more ferocious or a more timid mentality.

Some of the hormones that are secreted as a result of when we eat are Gastrin, Serotonin, Intestinal Gastrin, and Secretin.

Some secrete as a result to the encounter of fast food in the body, such as Leptin hormone.

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The main function of the digestive system is to convert food into energy and basic nutrients to nourish the entire body ensuring that it thrives.

The digestive system is composed of numerous organs that each aid the processes of extracting nutrients in order to nourish the body.

The different organs that can be found in the digestive system are the pharynx, esophagus, stomach, small intestine, large intestine, and finally the rectum.

The pharynx is the organ that connects the mouth and the esophagus which allows food to travel down to the stomach.

Without the esophagus, there would be no way for food to travel down into the digestive tract.

The purpose of the stomach is to use it’s gastric acid to digest any food that goes into.

In the small intestine, all food content that was not digested in the stomach gets digested here and later the nutrients get absorbed.

The large intestines job is to absorb excess water from the undigested material and direct it outside of the body because it is considered waste.

The job of the rectum is to take the final waste product out of the person’s body.

Mechanical digestion is the process at the beginning of the digestive system where food is broken down because the mouth chewed and bit the food.

An example of this is when a piece of bread is being masticated.

Chemical digestion is the process by which food is broken down into chemical substance that can later be absorbed.

An example of this is when bread reaches the stomach and begins to change into a state where its nutrients can be taken in.

It provides nutrients needed for energy, repair, and repair for the skeletal, muscular, and nervous system.

The digestive system extracts calcium from the foods eaten and later sends it of to the skeletal system where bones grow healthy because of the amount of calcium it is given.

It also provides nutrient for the heart and blood vessels and then does the amazing feat of taking water and other nutrients from food and sending it to other organs.

The digestive system absorbs calcium that can be transferred to the skeletal system.

The digestive system processes food in different processes.

The stomach is located on the left side of the person while the liver is located on the right.

The stomach is made up of regions that are cardia, fundus, the body, and the pyloric section.

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The circulatory system carries out one of the most crucial jobs throughout the human body.

It has numerous jobs which consist of distributing oxygen and nutrients to cells of the body, carrying out all waste and carbon dioxide from cells, transporting water electrolytes, hormones, and enzymes.

In addition to this, the circulatory system protects against diseases, limit hemorrhage by forming blood clots and finally, it helps regulate body temperature.

Blood pressure is the pressure of the blood in the circulatory system.

It is measured by doctors because it is closely related to the force and rate of a person’s heartbeat.

Many people suffer from either high blood pressure or low blood pressure; this can affect that person’s health.

Having high blood pressure can be a fatal danger to a person’s health.

High blood pressure can cause a person to have damage caused to their heart or arteries, stroke, kidney damage, vision loss, memory loss, fluid in the lungs, angina which causes chest pains and peripheral artery disease.

Just like having high blood pressure, having to little pressure in your system can have serious repercussions to a person’s health.

Low blood pressure can cause dizziness, fainting, dehydration, lack of concentration, blurred vision, nausea, pale skin, shallow breathing, fatigue, and depression.

Having too high or too low blood pressure can affect a person’s health for the worse.

Veins are tubes that help circulate blood throughout the body.

These tubes carry blood with a lack of oxygen towards the heart.

The veins are what allow the circulatory system to send nutrients to so many places around the body such as to arms, legs and fingers.

Capillaries are any of the blood vessels that create a network amongst arterioles and venues.

Capillaries are the smallest of all blood vessels and serve to distribute oxygenated blood from arteries to tissue and to send deoxygenated blood back to the veins.

Arteries are any of the tubes lined with muscle that form a part of the circulation system by which oxygenated blood is transferred from the heart to the rest of the body. Blood hear is usually always oxygenated.

The veins in the circulatory system are fed into the heart which is considered to be a cardiac muscle of the muscular system.

The blood circling inside a person leads to tissues as well as organs that need oxygen rich blood in order to continue working such as the fingers and arms.

The circulatory system brings oxygen from the lungs and nutrients from the digestive system and carries it to the different parts of the body.

Blood also carries away wastes that are found in the body such as carbon dioxide.

It maintains the same temperature by distributing heat amongst all organs in the body.

Blood is transported around the body through veins and arteries.

Arteries carry blood away from the heart while the veins carry blood towards the heart.

The components of the circulatory system are the blood, the heart, and the blood vessels.

In today’s modern world of medicine, doctors use the circulatory system to determine the disease that the person has contracted.

Arteries continue to branch out until they form numerous capillaries.

Blood is the only fluid tissue in the body.

Blood cells float throughout the body in plasma.

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The main purpose of the respiratory system is to help your body breathe which in turn keeps the human body healthy enough for oxygen to travel to all areas of the body that need oxygen to travel to all areas of the body that need oxygen in order to stay stable enough, not to cause harm to that organism's body.

The purpose of the respiratory system is to breathe for the body in order to ensure no cell
has a lack of oxygen.

As the respiratory system inhales, oxygen is taken into the body and spread amongst the
rest of the body’s cells.

Once the oxygen has gone through the body carbon dioxide is exhaled outward.

Lungs help oxygen from the air that is breathed enter red blood cells.

The diaphragm contracts causing the lungs to expand allowing more air to be taken in it also has the job of attracting oxygen and repelling carbon dioxide.

The mouth has the job of inhaling oxygen.

The nose has a job similar to the mouth where oxygen is inhaled .

The throat has the function of collecting incoming air.

The bronchial tubes have the job of distributing air to the lungs.

Firstly, oxygen enters through a person’s nose or mouth. The oxygen the
passes through the larynx and then passes through the trachea and then
enters the chest cavity. Once in the chest cavity, the trachea splits into two
tubes named the bronchi; once the oxygen passes through hear, it then
passes through the bronchial tubes which formed as the bronchi divided. The
oxygen continues traveling down this path until it reaches the lungs, where
the bronchial tubes divide once more and lead to tiny sacs called alveoli. The
oxygen then passes through the alveoli and goes into the blood system with
the help of the capillaries. Once the carbon dioxide has gathered, it is then
exhaled outward traveling the same path as when oxygen was being inhaled.
Throughout this process, the diaphragm helped pump carbon dioxide
outward and pulled the oxygen inward.

The respiratory system gives oxygen to all organs of the body and disposes of carbon dioxide.

Without oxygen in organs, no organ can function properly because the body would be contaminated with carbon dioxide which is poisonous.

The nose is the only external part of respiration.

Oxygen is transported to different [arts of the body with the help of the cardiovascular system that uses blood vessels as a way to transport oxygen from the lungs to the organs.

The air inside the lungs are often warm and damp.

The mucus inside the nose filters incoming air to ensure no pathogens enter the body.

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The main function of the nervous system is to regulate the body's actions with the use of electrical impulses known as synapse that travel along various axons.

The nervous system is one of the most important systems in the human body because it dictates the actions of all other organs.

Nerves are a fiber or a group of fibers that transmits impulses of  feeling to the brain as well as the spinal cord.

Once the synapses have reached the spinal cord, the signals continue on to the rest of the
organs in the body.

Nerves transmit information from the brain to the rest of the body in milliseconds as it moves to the organ the brain needed to complete a function.

The autonomic nervous system regulates the functions our internal organs such as the heart, stomach, and intestines.

The actions that are regulated by the autonomic nervous system are breathing, the heartbeat, and the digestive tract.

The voluntary nervous system is the part of the peripheral nervous system associated with the voluntary control of body movements.

Some examples of this would be the skin cells that sense when they are in contact with an object.

The central nervous system is the complex group of nerves that controls the activities of the
body.

It is made up of the brain and the spinal cord.

The peripheral nervous system is made up of nerves that transmit messages to the brain and can be found outside of the central nervous system.

Nerves run inside bones and joints, to feel; pain and the sense of movement.

Nerves run through muscles to bring sensations to the brain.

The nerves regulate the heart and blood pressure.

The nerves help the immune system working together with the lymphatic system to protect the organs from sicknesses.

The nervous system helps maintain the respiratory systems rhythm.

It helps with the movement of the stomach as well as the gall bladder.

The nervous system works in two directions, one goes to the brain and spinal cord to the farther parts of the body.

The other way is from the far parts of the cells, organs, and limbs, back to the brain.

There is a part of the nervous system that captures the senses and conducts all the sensations to the central nervous system.

In response to this, the central nervous system.

The other part sends responses from the central nervous system to the muscles and glands.

The nervous system is made up of two types of cells which are supporting cells and neurons.

Neurons are the structure of the nervous system.

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The main purpose of the human body's skeletal system is to provide support for the rest of the body.

In addition to this, the skeleton gives the body structure, without it, the human body would become flimsy.

By the time a human has reached full maturity, their body will contain 206 bones that contain a diversity of bones.

The human organism contains two different types of bone that each
contain their own properties that set them aside from the other.

The two kinds of bones that are located in the human body are compact
and spongy bone.

Compact bone is the harder, denser bone that can be found in the body.

It is made up of cells that strengthen it allowing it to be more rigid than spongy bone.

Spongy bone is less durable than compact bone but still serves its purpose
in supporting the frame of the body.

It is composed of spicules that intertwine with each other, forming a kind of weave amongst the bone.

The axial skeleton is the part of a human’s skeleton that is made up of the bones of the head and the vertebrate.

It is composed of a total of 80 bones that include the skull as well as the rib cage.

This group of bones is one of the most important because it protects the body’s most vital organs from any outside forces that may harm it.

The bones that are located in this region are the skull bones, the ossicles of the middle ear, the hyoid, the rib cage, sternum, and the vertebral column.

The appendicular skeleton is the part of a human’s skeleton that consists of the girdles
as well as the skeleton of the limbs.

It is composed of eighty bones that include the bones that are located in the limbs of humans such as arms and legs.

They can also be found in the pelvic region of the body as well as the hip region.

Some bones that can be encountered in this region are the clavicle, scapula, humerus, radius, ulna, carpals, metacarpals, phalanges, coxal, femur, tibia, fibula, patella, tarsals.

If one vital organ such as the brain, is to get damaged, many other actions the body does will not be able to be accomplished.

The skull protects the control center of the entire body otherwise known as the brain.

This organ is important because it sends synapses to the rest of the body allowing it to move.

The ribs protects other organs essential for the survival of an organism.

The 24 rib bones found in the chest cavity protect the heart, lungs, and the liver.

Bones contribute to the body’s shape by given it form.

It keeps safe the vulnerable and important bones safe.

The skeletal system protects the brain in the nervous system and the stomach in the digestive system.

Also, the ribs which are part of the skeletal system protect the body’s lungs which are part of the respiratory system.

Skeletal muscles are used as levers so that the body can move.

The way joints are put together determine the way the body can move.

Bones are made of calcium and phosphate and are essential for the body to function.

The bones contain bone marrow which is important to the survival of organisms.

The skeletal system contains different kinds of bones that perform their own functions.

These are long bones, short bones, flat bones and irregular bones.

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The main purpose of the human body's muscular system is to provide movement to a persons body, this system allows the human body to move around. There muscles contract as the body tells it to causing motion.

The human body contains three different types of muscle which are
composed of cardiac, smooth, and skeletal muscles.

The most common type of muscle in the human body is skeletal
muscle.

This is because it is the sole muscle that powers the body’s
skeleton making it vital for survival.

Cardiac muscle is the most rare muscle in the human body because it
can only be found in the heart of a human.

This is the muscular system of the heart Cardiac muscle is what transports blood throughout the body allowing nutrients to get to each and every part of the body.

Smooth muscle is muscle in which it’s contractile fibrils are not so ordered.

Due to this, the muscles that can be classified as smooth are involuntary.

Smooth muscle can be found in the abdominal region where the internal organs that preside there such as the stomach and intestines have involuntary motion.

This muscle is also responsible for the contraction of hollow organs, the bladder, and the uterus.

Smooth muscle can be separated into two groups; single-unit and multi-unit smooth muscle.

Single-unit smooth muscle, found in the uterus, intestinal tract and bladder, is when all cells in the muscle behave as one unit.

Skeletal muscle is muscle that is connected to a human’s skeleton.

This muscle is what allows limbs such as arms and other parts of the
body to move.

Each skeletal muscle is attached to bone on one side, stretches across a joint, and is then attached to the end of another bone.

Tendons are a flexible but, tough strand of tissue that attaches muscle to one allowing the human body to keep together.

Tendons tend to flexible enough to allow easy movement among the
body, but also strong enough to support the weight of that muscle.

The two kinds of muscle in the human body that determine the movement of the muscles are called voluntary and involuntary muscles.

Voluntary muscles are muscles that the human body itself can control when it moves.

An example of this muscle is the biceps as well as the arm and leg muscles.

Involuntary muscles are muscles that the human body cannot control when it moves or contracts.

Some examples of this muscle is the stomach and the heart.

Every muscles in the human body are connected to each other in some way
that allows the body to move the way it does.

For example, to complete the
simple action of smiling, it takes a total of 26 facial muscles in order to achieve that face.

When running, numerous muscles in the body move with one another in order to achieve motion at a constant rate.

For example, as the soleus muscle in the leg moves, the Achilles tendon moves along with it causing the biceps to move.

In addition to this, the intestinal tract in the gut moves along together in an effort to take food ingested and deliver it to the excretory system.

The muscular system is what allows the skeletal system to move.

The muscles in this system move the bones in the skeletal system by
providing energy to that specific area that needs movement.

Also, the muscular system is prominent in the digestive system
because the organs in that system such as the stomach are smooth
muscles; without the muscles in the digestive system, the body could
not function properly.

Lastly, the muscular system allows waste to be taken out of the body
therefore helping the excretory system complete its function.

Muscles act along with bones to produce movement.

The muscles regularly end in joints to permit free movement. The arrangement of muscles in the body allow them to either work together or work separately.

Muscles can only pull and can never push.

Muscles are named depending on location, shape, size, action, origin, and direction of the muscular fibers.