Question 21 Which of the following occurs when depolarization reaches its thresh
ID: 3511632 • Letter: Q
Question
Question 21
Which of the following occurs when depolarization reaches its threshold (in the nervous system)?
A.
Irritability
B.
Conductivity
C.
Resting membrane potential
D.
Action potential
E.
Increase in parasympathetic tone
Question 23
1. A reduction in end-diastolic volume would result in
A.
Increased afterload and low cardiac output
B.
Reduced afterload and increased cardiac output
C.
No effect on afterload and reduced cardiac output
D.
Increased pulmonary activation
Question 27
A person that takes a drug that reduces capillary recruitment during exercise would
A.
Improve VO2peak since the heart is not affected
B.
Improve stroke volume and cardiac output as afterload would be reduced(che)
C.
Have a reduced VO2peak relative to normal recruitment
D.
Not enough information
Question 32
1. When a person stops exercising abruptly at peak exercise
A.
The skeletal muscle pump maintain venous return
B.
Preload rapidly falls resulting in reduced cardiac output and dizziness
C.
Afterload rapidly rises since the muscles are in a static contraction
D.
None of the above
Question 45
During concentric muscular contractions...
A.
Force increases as contractile velocity increases due to a faster cycling rate of myosin
B.
Force increases as contractile velocity increases due to the elastic properties of muscle tissue
C.
Force decreases as contractile velocity increases due to the buildup of lactic acid(che)
D.
Force decreases as contractile velocity increases due to the increased cycling rate of myosin
A.
Irritability
B.
Conductivity
C.
Resting membrane potential
D.
Action potential
E.
Increase in parasympathetic tone
Explanation / Answer
21) D) when depolarization reaches threshold, action potential is achieved.
It is when the depolarization reaches -55Mv.
23) c) after load Is not affected with reduced end diastolic volume as afterload is the ventricular pressure at the end of systole
Reduction in end diastolic volume decreases cardiac output.
27)c) capillary recruitment decreases resistance to flow as number of capillaries increases .hence reducing capillary recruitment causes decrease in VO2 compared to normal recruitment
32)b) preload falls suddenly due to sudden decrease in end diastolic volume when exercise is abruptly stopped
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