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(Your Digestive System & How It Works - NIDDK, n.d.)

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The digestive system is important since it intakes food, chemically breaks down enzymes, and absorbs nutrients. When food enters the digestive system, it sends impulses, which will send signals to the cardiovascular system increasing the heart rate allowing more blood to flow, and allowing the digestive system to digest the food (Your Digestive System & How It Works - NIDDK, n.d.).

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 (How Your Circulatory System Works, n.d.)

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Three important features of the circulatory system are that it transports oxygen around the body, removes waste, and maintains blood flow around the body (Circulatory System, n.d.). The carbon dioxide that the human body inhales moves from the blood into the air inside the alveoli, which will allow the body's lungs to exhale the carbon dioxide out of the human body.

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(Respiratory System: Organs, Facts, Anatomy & Function, n.d.)

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The respiratory system is important for absorbing oxygen, removing carbon dioxide, and producing sound for the vocal cords (Respiratory System: Organs, Facts, Anatomy & Function, n.d.). When using their vocal cords, their respiratory system allows air to flow through the vocal cords which will enable them to vibrate, allowing the human to produce noise (Respiratory System: Organs, Facts, Anatomy & Function, n.d.).

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(Patient Education | Division of Endocrinology, Metabolism & Lipid Research | Washington University in St. Louis, n.d.)

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The three important features of the endocrine system are managing reproduction, regulating metabolism, and controlling growth (Endocrine System: What It Is, Function, Organs & Diseases, n.d.). when the endocrine system makes the adrenaline hormone, the diaphragm of the respiration system relaxes (How Does the Endocrine System Work With the Respiratory System?, n.d.).

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(The Musculoskeletal System Review (Article), n.d.)

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The musculoskeletal supports the body's structure, stores minerals like calcium, and facilitates blood flow (Skeletal System: What It Is, Function, Care & Anatomy, n.d.). The Musculoskeletal protects the organs and systems that help with the human's survival (Bones, Muscles, and Joints | Healthdirect, n.d.).

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(Central Nervous System (CNS) - Function, Disorders | Healthdirect, n.d.)

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The nervous system controls the motors in the body, it controls the sensory perception and processing of information from the brain (What Does the Nervous System Do? | NICHD - Eunice Kennedy Shriver National Institute of Child Health and Human Development, 2018). The nervous system uses the information from the brain to tell each system and organ to do things like increase blood flow.

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The immune system helps find and sense foreign invaders, target specific pathogens, and attack bad bacteria (Immune System Explained, n.d.). The immune system helps regulate the bone density and mass of the human skeleton.

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The reproductive system reproduces gametes, produces sex hormones, and facilitates fertilization (Reproductive System, n.d.). The circulatory system transports oxygen and nutrients to and from the reproductive system (Flexi Answers - What Other Systems Work With the Female Reproductive System?, n.d.).