Source: Adapted from A.M. Katz (ed.), Physiology of the Heart, 3rd Ed., 2001.

Action Potentials Cardiac Myocytes

Fig. 6. Typical cardiac action potentials (slow on top and fast below). The resting membrane potential, threshold potential, and phases of depolarization (0-4) are shown.

Table 1

Ion Concentrations for Mammalian Myocytes

Intracellular concentration (millimolar)

Extracellular concentration (millimolar)

Sodium (Na) Potassium (K) Chloride (Cl) Calcium (Ca)

Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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