Anatomy and Physiology

The Lymphatic System

The Key Players in the Lymphatic System Anatomy of the Lymphatic System Components of the lymphatic system are the spleen, tonsils, adenoids, appendix, thymus gland, and lymph nodes. The spleen helps fight certain types of bacteria. The tonsils, adenoids, and appendix were once believed to be vestigial organs, meaning they are remnants left over from human evolution. Now, scientists have found …

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The Endocrine System

This lesson introduces the endocrine system and the role it plays in the maintenance of homeostasis. Functions of the Endocrine System The endocrine system works with the nervous system to regulate the activities critical to the maintenance of homeostasis. The following are the main functions of the endocrine system: Water balance Uterine contractions and milk …

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The Nervous System

This lesson introduces the anatomy of the nervous system, including its functions and divisions. It also explores the parts of neuron, neural conduction, and synaptic transmission. What Is the Nervous System? From perceptions to daily experiences, the nervous system controls many aspects of the human body. This system coordinates several activities in the body. It governs people’s …

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The Integumentary System

This lesson introduces the anatomy of the integumentary system, including the system’s function. This lesson also describes the effects of aging and cancer on the integumentary system. The Skin’s Many Layers The integumentary system is a body system comprised of the skin and accessory structures, including the hair, sebaceous and sweat glands, and nails. This system protects …

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The Muscular System

This lesson introduces the anatomy of the muscular system, including the three different muscle tissues. This lesson also describes the role of the muscular system in movement and the physiology of muscle contraction. Anatomy of the Muscle The muscular system is responsible for all types of body movement. Additional functions of this system include providing support, stabilizing …

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The Skeletal System

This lesson introduces the anatomy and functions of the skeletal system. This lesson also explores how bone forms, remodels, and constantly changes as a person grows. Skeletal System Overview A human is born with roughly 270 bones. As a person grows, this number decreases to approximately 206. This is because many of the bones fuse. …

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The Urinary System

This lesson introduces the anatomy of the urinary system and how it functions. This lesson also explores the role of other body systems, particularly the circulatory and endocrine systems, in aiding with urinary excretion, absorption, and filtration. Anatomy of the Urinary System Inside the body, the kidney, ureters, bladder, and urethra make up the urinary system, …

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The Reproductive System

Male Reproductive System Like all biological systems, the male reproductive system is comprised of several organs. These organs are located outside or within the pelvis. The main male reproductive organs are the penis and the testicles, which are located external to the body.  The penis is composed of a long shaft and a bulbous end called the glans …

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The Gastrointestinal System

Anatomy of the Digestive System This lesson introduces the structures and functions of the digestive system. The following are the functions of the digestive system: Take in food. Break down food. Absorb digested molecules. Provide nutrients. Eliminate wastes. The digestive system consists of the digestive tract, which is a tube extending from the mouth to the …

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