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The endocrine system is a chemical messenger system comprising feedback loops of the hormones released by internal glands of an organism directly into the circulatory system, regulating distant target organs

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The endocrine system is a chemical messenger system comprising feedback loops of the hormones released by internal glands of an organism directly into the circulatory system, regulating distant target organs

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The respiratory system is a biological system consisting of specific organs and structures used for gas exchange in animals and plants.

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The respiratory system is a biological system consisting of specific organs and structures used for gas exchange in animals and plants.

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The blood circulatory system is a system of organs that includes the heart, blood vessels, and blood which is circulated throughout the entire body of a human or other vertebrate

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The blood circulatory system is a system of organs that includes the heart, blood vessels, and blood which is circulated throughout the entire body of a human or other vertebrate

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The digestive system is made up of the digestive tract and other organs that help the body break down and absorb food

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The digestive system is made up of the digestive tract and other organs that help the body break down and absorb food

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A reproductive system is a system of organs and processes that take part in the reproduction or formation of new similar young living organisms.

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A reproductive system is a system of organs and processes that take part in the reproduction or formation of new similar young living organisms.

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the complex group of defense responses found in humans and other advanced vertebrates that helps repel disease-causing organisms (pathogens).

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the complex group of defense responses found in humans and other advanced vertebrates that helps repel disease-causing organisms (pathogens).

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complex network of neurons specialized to carry messages

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complex network of neurons specialized to carry messages

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 organ system that gives humans the ability to move using their muscular and skeletal system

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 organ system that gives humans the ability to move using their muscular and skeletal system

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Female Reproductive System Parts - 5 Parts Of Female Reproductive System - Spesial 5 / The uterine tubes form the initial part of the duct system through which the gametes travel. - Ji Greco

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Immune System: Parts & Common Problems (clevelandclinic.org)

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Nervous system | Definition, Function, Structure, & Facts | Britannica

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Musculoskeletal system: Anatomy and functions | Kenhub

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Ask Dr. Rob: The Body Form and Function – The Force for Health® Network

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Your Digestive System & How it Works - NIDDK (nih.gov)