Foundational Sciences

Anatomy

The structure of the body, system by system.

8 lessons

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  1. Lesson 1 introductory The Skeletal System The 206 bones of the adult skeleton support and protect the body, store minerals, and make blood, while joints and bone cells keep the framework alive and adaptable. 3 cites
  2. Lesson 2 introductory The Cardiovascular System The heart, blood vessels, and blood form a closed transport loop that delivers oxygen and nutrients to every tissue and carries waste away for disposal. 3 cites
  3. Lesson 3 introductory The Nervous System The brain, spinal cord, and nerves gather sensory information, process it, and command the body's responses using fast electrical and chemical signals. 3 cites
  4. Lesson 4 introductory The Muscular System Skeletal, smooth, and cardiac muscle generate every movement of the body, from walking to heartbeat, by converting chemical energy into force through the sliding of protein filaments. 3 cites
  5. Lesson 5 introductory The Respiratory System The airways and lungs move air to the alveoli, where oxygen enters the blood and carbon dioxide leaves it, all under automatic control from the brainstem. 3 cites
  6. Lesson 6 introductory The Digestive System The digestive tract and its accessory organs break food into absorbable nutrients, take those nutrients into the blood, and eliminate the residue as waste. 3 cites
  7. Lesson 7 introductory The Urinary (Renal) System The kidneys filter the blood through millions of nephrons to remove waste, balance water and electrolytes, and produce urine that is stored and expelled by the bladder. 3 cites
  8. Lesson 8 introductory The Endocrine System Endocrine glands release hormones into the blood to regulate metabolism, growth, and body chemistry, coordinating the whole body through slow but powerful chemical signals controlled by negative feedback. 3 cites