n the ventricles, the action potential travels along the interventricular septum to the
apex of the heart, where it then spreads superiorly along the ventricle walls. -
ANSWER TRUE
the semilunar valves remain open throughout the ____ phase of the cardiac cycle. -
ANSWER late ventricular systole...
, During which phase of the cardiac cycle does aortic pressure reach its maximum? -
ANSWER Ventricular ejection
During which complete phase of the cardiac cycle do both the atria and ventricles relax?
- ANSWER Isovolumetric - ventricles relax
Which of the following statements is not true regarding ventricular systole? -
ANSWER The ventricles relax.
Which of the following is caused by excitation of cardiac muscle? - ANSWER The
opening of voltage sensitive membrane calcium channels on the T tubules
An action potential in a cardiac muscle fiber is identical to an action potential in
a skeletal muscle fiber. - ANSWER False
The sum of the blood velocity of arterioles is equal to the blood velocity of the artery that
feeds them. - ANSWER True
How do materials get from the blood to the surrounding tissues? - ANSWER Diffusion,
filtration and absorption, and transcytosis
The blood flow to the body organs __________. - ANSWER Is inversely proportional to
the resistance of the arterioles leading to them
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