Khan Academy

Flow through the heart-video (K-A)

Stroke work in PV loops and boxes (K-A)

Regulation of blood pressure with baroreceptors (K-A)

Layers of a blood vessel-video (K-A)

What is afterload? (K-A)

Renin production in the kidneys (K-A)

Lub dub (K-A)

What is contractility? (K-A)

Umbilical vessels and the ductus venosus (K-A)

Meet the heart! (K-A)

What is preload? (video) (K-A)

Putting it all together: Pressure, flow, and resistance-video (K-A)

A race to keep pace! (K-A)

Resistance in a tube-video (K-A)

Action potentials in cardiac myocytes (K-A)

Thermoregulation in the circulatory system (K-A)

Action potentials in pacemaker cells (K-A)

Two circulations in the body (K-A)

Depolarization waves flowing through the heart (K-A)

Calcium puts myosin to work (K-A)

Electrical system of the heart (K-A)

Heart cells up close! (K-A)

Membrane potentials – part 1 (K-A)

How tropomyosin and troponin regulate muscle contraction (K-A)

Membrane potentials – part 2 (K-A)