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The endocrine system is the collection of glands that produce hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood, among other things.
The endocrine system is made up of the pituitary gland, thyroid gland, parathyroid glands, adrenal glands, pancreas, ovaries (in females) and testicles (in males).

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The digestive system is a group of organs working together to convert food into energy and basic nutrients to feed the entire body. Food passes through a long tube inside the body known as the alimentary canal or the gastrointestinal tract (GI tract). The

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The circulatory system is a vast network of organs and vessels that is responsible for the flow of blood, nutrients, hormones, oxygen and other gases to and from cells. Without the circulatory system, the body would not be able to fight disease or maintain a stable internal environment  such as proper temperature and pH known as homeostasis.

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Red blood cells collect the oxygen from the lungs and carry it to the parts of the body where it is needed, according to the American lung Association. During the process, the red blood cells collect the carbon dioxide and transport it back to the lungs, where it leaves the body when we exhale.

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The human respiratory system is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The primary organs of the respiratory system are lungs, which carry out this exchange of gases as we breathe.

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There are two types ofcells in the peripheral nervous system. These cells carry information to sensory nervous cells  and from motor nervous cells the central nervous system. Cells of the sensory nervous system send information to the CNS from internal organs or from external stimuli.

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The nervous system is a complex collection of nerves and specialized cells known as neurons that transmit signals between different parts of the body. It is essentially the body’s electrical wiring. ,The nervous system has two components: the central nervous system and the peripheral nervous system. According to the NIH, the central nervous system is made up of the brain, spinal cord and nerves. The peripheral nervous system consists of sensory neurons, ganglia which is the clusters of neurons and nerves that connect to one another and to the central nervous system.

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Smooth muscle makes up the walls of hollow organs, respiratory passageways, and blood vessels. Its wave like movements propel things     through the bodily system, such as food through your stomach or urine through your bladder. Like cardiac muscle, smooth muscle is involuntary and also contracts in response to stimuli and nerve impulses.

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The Muscular System Explained In 6 Minutes

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Electrical Connection Between Cardiac Muscle Cells

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Uploaded by Future Nurses on 2014-09-11.

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Skeletal muscles are attached to bones by tendons, and they produce all the movements of body parts in relation to each other. Unlike smooth muscle and cardiac muscle, skeletal muscle is under voluntary control. Similar to cardiac muscle, however, skeletal muscle is long, thin, multinucleated fibres are crossed with a regular pattern of fine red and white lines, giving the muscle a distinctive appearance.

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Cardiac muscle is found only in the heart, cardiac muscle is responsible for pumping blood throughout the body. Cardiac muscle tissue cannot be controlled consciously, so it is an involuntary muscle. The cells of cardiac muscle tissue are striated. The arrangement of protein fibers inside of the cells causes these light and dark bands. Striations indicate that a muscle cell is very strong, unlike visceral muscles.

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This is found inside of organs like the stomach, intestines, and blood vessels. The weakest of all muscle tissuesis the visceral muscle  which makes organs contract to move substances through the organ. Because visceral muscle is controlled by the unconscious part of the brain, it is known as involuntary muscle meaning it cannot be directly controlled by the conscious mind.

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Muscular System. (n.d.). Retrieved April 13, 2016, from http://www.innerbody.com/image/musfov.html
Skeletal muscle. (n.d.). Retrieved April 14, 2016, from http://www.britannica.com/science/skeletal-muscle
Muscular. (n.d.). Retrieved April 17, 2016, from http://www.healthline.com/human-body-maps/muscular-system

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There are three types of muscle tissue these are Visceral, cardiac, and skeletal.