The action potential of cardiac pacemaker cells is caused by ________.

A. inward diffusion of K+
B. inward diffusion of Na+
C. outward diffusion of K+
D. inward diffusion of Ca2+


Answer: D

Anatomy & Physiology

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Fill in the blank(s) with correct word

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Stretching a skeletal muscle beyond rest length reduces the force of contraction because of:

A. increased Ca++ sensitivity of actin-myosin interaction B. increased Ca++ influx through stretch activated channels C. decreased actin-myosin overlap D. decreased Ca++ uptake by the SR E. decreased intracellular pH

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How can DEXA scans be used to diagnose endocrine disorders?

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________ are macrophages found in and around blood channels in the liver.

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Anatomy & Physiology