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Fernandez, D. (N.D.) Human Nervous System HD Png Download

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The Nervous System
Has more than one type of Nervous system. The Nervous system's purpose is to send messages from all over the body to and from the brain. Working with involuntary messages and voluntary messages. Thus helping the body function correctly and move correctly as well.
The Nervous system works with the Digestive system, in a  system called the Enteric Nervous system. The enteric nervous system’s network of nerves, neurons, and neurotransmitters extends along the entire digestive tract – from the esophagus, through the stomach and intestines, and down to the anus (Cleveland Clinic, n.d.) Thus moving food into the Digestive system.

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Harrison, R. J. (2020, February 4) Human reproductive system

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The Reproductive System
Now, the reproductive system's purpose is to procreate to ensure the survival of the given species. In this case, being the human race. Along with the creation of sperm and egg cells.
Endocrine glands in the reproductive system produce sex hormones that are responsible for secondary sex characteristics in men and women. Sex hormones also contribute to the production of sex cells or gametes. Female sex hormones regulate ovulation, the menstrual cycle, and pregnancy. (Endocrine & Reproductive Systems, n.d.)

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The Immune System
This specific system protects the body from harmful diseases, infection and helps with recovery.
With this in mind, the Immune system and the Respiratory system work together when the host is breathing in oxygen, along with harmful bacteria. The Immune system will then eliminate said bacteria that will attempt to make its way into the host or body.

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Villa-Forte, Alexander (2020, January) Muscles

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The Musculoskeletal System
This system consists of the muscle, tendons, bone, and tissue. An important factor of this system is that it protects the body, and helps it function.
The Musculoskeletal system and the Nervous system work together very closely. The Nervous system tells and helps the muscles, tendons, etc. the move and to operate.

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Rogers, E. Matthews, B., & Oliver, M. (2020, November 16) Circulatory system. 

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The Circulatory System
The main purpose of this system is to move blood around the body. Blood circulates inside blood vessels and circulates unidirectionally from the heart around one of two circulatory routes, then returns to the heart again; this is a closed circulatory system (Fowler & Others, 2021).
The circulatory system provides your brain with a constant supply of oxygen-rich blood while your brain regulates your heart rate and blood pressure ("You Can't Have...", 2016). Thus indicating that the nervous system and the circulatory system work together to keep the blood pressure of the body under control.

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Norris, David O. & Schwartz, Theodore B. (2021, June 15). Endocrine system

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The Endocrine System
It's importance is to create hormones to balance growth and mood, and development. Along with regulating the release of hormones as well.
The endocrine system coordinates with the nervous system to control the functions of the other organ systems (Fowler & Others 2021).

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Buckley, G. (2021, January 15) Respiratory system

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The Respiratory System
It's main purpose is to breathe, taking in the needed oxygen along with releasing Carbon-Dioxide. Along with removing harmful gases from the body as well.
The circulatory system (cardiovascular system) pumps blood from the heart to the lungs to get oxygen. The heart then sends oxygenated blood through arteries to the rest of the body. The veins carry oxygen-poor blood back to the heart to start the circulation process over (Circulatory System, n.d.).

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Dworken, H. J., Hightower, N. C., Keeton, W. T., & Sircus, W. (2020, November 4) Human digestive system

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The Digestive System
It's main purpose is to break down the food obtained, breaking it into nutrients and waste. Along with the process of getting rid of said waste. The Digestive system and the Circulatory system work together by carrying the nutrients needed around the body.