Foundational Sciences

Physiology

How the body’s systems function and keep themselves in balance.

4 lessons

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  1. Lesson 1 introductory Homeostasis and Feedback Control How the body keeps its internal environment stable using set points and feedback loops, with worked examples from temperature, blood glucose, clotting, and labor. 3 cites
  2. Lesson 2 intermediate Membrane Potentials and the Nerve Impulse How neurons build and use electrical charge across their membranes, from the resting potential and the sodium-potassium pump to the action potential, saltatory conduction, and synaptic transmission. 3 cites
  3. Lesson 3 intermediate Cardiac and Circulatory Physiology How the heart's cycle and electrical conduction generate blood flow, how cardiac output and blood pressure are calculated and regulated, and how the baroreceptor reflex maintains perfusion. 4 cites
  4. Lesson 4 intermediate Fluids, Electrolytes & Acid–Base Balance How body water is distributed among compartments, how key electrolytes and osmosis govern fluid shifts and hydration, and how buffers and the lungs and kidneys defend blood pH. 4 cites