During contraction of heart muscle cells ________
A) all of the calcium required for contraction comes from storage in the sarcoplasmic reticulum
B) some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores
C) calcium is prevented from entering cardiac fibers that have been stimulated
D) the action potential is prevented from spreading from cell to cell by gap junctions
B
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Cells that store fat are called
A) fibrocytes. B) macrocytes. C) adipocytes. D) podocytes. E) melanocytes.
Damage to the ________ is referred to as heart block.
A) SA node B) AV valves C) AV bundle D) AV node
Why is the normal baroreceptor reflex absent during exercise?
What will be an ideal response?
The brachiocephalic artery is relatively short and rapidly divides into the:
A. internal and external carotid arteries. B. brachial artery and the posterior vertebral arteries. C. right common carotid artery and right subclavian artery. D. internal carotid arteries and posterior vertebral arteries.