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The endocrine system will create hormones that will later be sent out to your body to take care of a child's growth, mindset, organ functions, metabolism, and reproduction.

The hypothalamus is the connection between the endocrine and the nervous system. The nervous system releases chemicals that control the amount of hormones let out by the pituitary gland. For example, the brain may analyze the brightness, temperature, or emotions and send them to the pituitary for hormone excretion that matches how the body react to changes.

The pituitary gland, while no larger than a pea, is referred to as the "master gland". It controls growth hormones, prolactin (begins lactation for new mothers), thyrotropin (tells the thyroid gland to create thyroid hormones), corticotropin (tells the adrenal gland to make different kinds of hormones), antidiuretic (regulates water balance within the body to prevent damage to kidneys), and oxytocin (triggers labor contractions). The pituitary gland also excretes endorphins (reduces pain), hormones that tell reproductive organs to make sex cells, and it starts a girl's menstrual cycle.

The thyroid is a butterfly shaped part that sits in the center of the lower neck. It creates thyroxine and triiodothyronine, which control how quickly food is burned for fuel by the cells. More thyroid hormones lead to quicker chemical reactions.

Four much smaller glands called parathyroids connect to the thyroid. They regulate the amount of calcium in the bloodstream with the help of a thyroid made hormone called calcitonin and their own parathyroid hormones.

Adrenal glands are triangular, and both sit on their own kidneys. Of the two glands, both have two other parts that work differently. The first of two is the corticosteroid creating part, the adrenal cortex. The cortex is the outer shell of the glands. It'll regulate metabolism, salt to water ratio in the body, responses to stress, and sexual growth and work. Inside the glands is the adrenal medulla, the medulla creates catecholamines, like epinephrine, better known as adrenaline. Adrenaline will raise heart rate and blood pressure in stressful events.

The pineal body/gland excretes a hormone called melatonin, which may help with a person's sleep schedule.

Reproductive glands, also known as gonads, are what mainly creates sex hormones. Both genders have gonads, the male versions called testes, are located in the scrotum they release androgens like testosterone. Testosterone is mostly present during puberty. Female gonads are called ovaries, located in the pelvis. Ovaries make eggs that will release estrogen and progesterone. Estrogen is associated with puberty, together with progesterone the two hormones are involved with menstrual cycles.

The endocrine system is like a thermostat, the glands detect the current state inside, and hormones will change that current state to have more balance within your body, and to remain satisfactory to you.

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The digestive system's overall function is to break down food and extract the nutrients during the process to fuel the body.

The first part of the digestive system that food runs into is the mouth. The meal will get chewed if necessary, and the starches within will be taken apart into sugar by saliva.

Another one of the organs in the digestive system is the esophagus. After food is chewed and saliva breaks down starch into sugar, it's sent down the esophagus, which will squeeze the food to make it go down into the stomach easier. The esophagus doesn't normally taken any longer than 5 seconds.

After the esophagus comes the stomach, which stores the food until the next organ is ready for it. While in the stomach, food will get squished into a liquid. Lastly, the liquid will flow into the small intestine.

The small intestine breaks down the food for its nutrients, which get absorbed by the walls of the organ, or by the gallbladder, liver, or pancreas.

The pancreas makes a liquid that breaks down proteins and fats, and the gallbladder stores the bile until needed.

The liver has many other uses than just one, like the pancreas or gallbladder. The liver makes bile to regulate the amount of fat in blood, acts as a semi-permeable barrier that blocks out waste (sometimes also making more bile out of it), and divides the nutrients between which will be sent through the body, and which will stay in storage.

On the more secluded side of the large intestine is the appendix, which doesn't yet have a defined purpose. It can cause life-threatening issues when infected, though.

The other end of the large intestine lies the colon. The colon will be the last organ to absorb water and nutrients from the food. After the colon, food hardens into a solid, becoming a stool, which is shoved into the rectum.

The rectum is the last place food will ever be in the body. It is released out of the rectum, and hopefully into a toilet bowl.

The digestive system works with the endocrine system by communicating via the excretion of hormones. The small intestine will release hormones like secretin, gastrin, and cholecystokinin when digesting food. This helps to maintain the pancreas' enzyme and stomach acid release, and the gallbladder's contractions. The circulatory system also works with the digestive system, by absorbing nutrients into the bloodstream through the small intestine's walls, where they'll soon be sent to body tissue.

The digestive system is like a food processing plant. Using what's nutritious to make energy for the human body in a multi-step process with workers that do many different things to get the final product out. In a sorting process, the workers remove waste by means of a different method than food processing.

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The lymphatic system is part of the immune system. Its main function is to extract extra lymph (a mixture of white blood cells, and protein and fat from intestines) from tissue, then return the liquid to the blood.

One of the parts of the lymphatic system is bone marrow, the thick, gelatinous substance found inside bones. Bone marrow is responsible for making many different kinds of blood cells, one of the kinds being immune cells.

Similar to bone marrow, the thymus gland will also make immune cells or, T-cells, either during puberty or before it starts.

Lymphatic vessels carry lymph back to the bloodstream after being taken out of tissue. They run through the body like blood vessels. The thoracic duct starts at the bottom half of the spine, going through the pelvis, abdomen, and bottom chest. Then, the lymph will go all the way up the chest and empty into the bloodstream through a vessel located on the left side of the neck.

The right lymphatic duct collects its lymph from the neck, chest, and arm on the right side. It empties the lymph into a vein on the right side of the neck.

Lymph nodes are spots of tissue in the lymphatic vessels that sort out disease-causing bacteria, viruses, and fungi from the lymph. Node clusters are found in the armpit, neck, groin, pelvis, and abdomen. Although, in the pelvis and abdomen they filter blood, not lymph. T and B cells fight off infection, with B cells making antibodies that will capture the bad kinds of germs (etc.) and remove them. When infection does happen, germs will cluster up inside lymph nodes, causing them to swell.

Tonsils are also apart of the lymphatic system, acting as a defense against pathogens. Tonsils hold T and B cells, that can detect pathogens and remove them. Unfortunately, tonsils can catch an infection while fighting them off.

The spleen will whittle old and/or damaged cells that can't carry out their job anymore. It'll also regulate blood cells and circulation. The spleen contains lymphocytes and macrophages. The blood cells will remove germs and other disease inducing visitors in the blood that passes through the spleen.

The circulatory system, or blood, gets lymph from the lymphatic system's vessels. The lymphatic system will also absorb dietary fat and vitamins from the digestive system, transporting them to the bloodstream through vessels. Bone marrow and the thymus have some impression through an immune cell's growth, which can change the endocrine system's hormonal reactions to infection and stress.

The lymphatic system is to the human body as gutters are to a house. They let water run through, blocking out anything not meant to go through their vessels. They protect from any damage being dealt to the structure by slowing down flow.

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The Circulatory System pumps blood from the heart to the rest of the organs through two kinds of blood vessels, replenishing their energy with the blood that carries oxygen throughout the body.

The heart, with an average of 60-100 beats per minute, pumps blood through all of our body, bringing oxygen so we can live. Blood rich with oxygen is pumped through our body to our organs, then returns to the heart only to be sent to the lungs for more oxygen and to repeat the earlier stages of the cycle. The heart has four different chambers, the upper chambers being called atriums, the lower being ventricles. Atriums take in the blood that was earlier being pumped out by the ventricles.

All four chambers are divided up by many different things, one being the interventricular septum, that separates the two ventricles. The interatrial septum separates the atriums. The left atrium and ventricle have the mitral valve settled between them. The tricuspid valve sits between the right ventricle and atrium. The pulmonic sits between the right ventricle to keep it away from the pulmonary artery that transports blood to the lungs. On the left is the aortic valve, that takes the blood through the other parts of the body.

The circulatory system works with the respiratory system to collect oxygen from the lungs, then deliver it around the body's tissue and organs via bloodstream. Then, the blood will pick up the used oxygen that has turned into carbon dioxide, and bring it back to the lungs to be removed. The blood will also absorb nutrients from the small intestine through the walls, delivering nutrients for things like energy. Some of the hormones released by the endocrine system can affect blood pressure, blood vessel expansion, and heart rate. The bloodstream will also send off other hormones that are meant for other organs.

The circulatory system is like a delivery service, workers coming by to one large structure to pick up exports, then going across long stretches of area to meet their destinations. A repeating cycle of coming and going to different places.

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The Respiratory System mainly takes in oxygen through inhalation, cycles it through the body to keep organs functioning, then let out carbon dioxide (the result of used oxygen) through exhalation.

Both the mouth and nose are parts of the respiratory system that carry out the same purpose. They inhale oxygen, for the lungs to work with, and exhale carbon dioxide (the waste from the lungs). Hairs that are inside the nostrils block anything that isn't meant to come into the lungs from passing by.

Once air has gone through either the mouth or nose, it comes to the pharynx, more commonly known as the throat. At the top of one of the two pipes is the larynx, or your voice box. They're a set of vocal cords that vibrate to make sound. Below the larynx is the trachea/windpipe. The trachea is lined with rings of cartilage that act as a structure to keep the tube open. Like the nose, the windpipe has cilia running throughout it. They take away unnecessary particles.

The trachea then divides into two bronchi, that will finally lead to the lungs by means of a layer of smaller bronchi, then even smaller bronchioles. Alveoli are the final part of the lungs, meeting with bronchioles to take in oxygen and pass back up carbon dioxide.

The thorax/chest cavity is made of bones and muscles to protect the lungs, heart, and other organs. Below the thorax is the diaphragm, a muscle that pulls and pushes to direct the lungs into inhaling and exhaling.

The respiratory system works with the circulatory system to pump blood cells and oxygen molecules throughout the body and organs. It also works with the nervous system to regulate breathing when needed and maintain homeostasis. The endocrine system also works with the respiratory system, when the hormone adrenaline is present, making breathing speed up. Lastly, the respiratory system also works with the muscular system, the diaphragm is a muscle that controls breathing.

The respiratory system to the human body is like a windmill to civilization. The respiratory system and a windmill both take materials from the air, and turn it into something that most humans use while they're alive.