Question 26 A sprint athlete you’re training states that he’s taking a supplemen
ID: 3511517 • Letter: Q
Question
Question 26
A sprint athlete you’re training states that he’s taking a supplement to boost fat oxidation within his fast-twitch muscle fibers. The effect of this on 100m sprint performance will be
A.
Improved performance
B.
Reduced performance
C.
No change
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
C.
Have a reduced VO2peak relative to normal recruitment
D.
Not enough information
Question 29
The neuromuscular junction is the interface between the end of a motor neuron and a muscle fiber.
True
False
Question 30
Exercise training improves capillary density in muscles
True
False
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
A.
Improved performance
B.
Reduced performance
C.
No change
Explanation / Answer
26. ANS: C. No change
The answer to the above question would be no change as triglycerides are used for prolonged exercise and not short-term activities such as a sprint.
27. ANS: B. Improve stroke volume and cardiac output as afterload would be reduced
A person that takes a drug that reduces capillary recruitment during exercise would improve the stroke volume and cardiac output as after load would be reduced.
29. ANS: True
A neuromuscular junction (or myoneural junction) is a chemical synapse formed by the contact between a motor neuron and a muscle fiber. It is at the neuromuscular junction that a motor neuron is able to transmit a signal to the muscle fiber, causing muscle contraction.
30. ANS: True
Capillary density refers to the amount of capillaries present at a certain site in your body.
While exercise temporarily increases the capillary density at muscle sites, it is possible to improve these changes in capillary density with training.
32. ANS: B. Preload rapidly falls resulting in reduced cardiac output and dizziness.
During exercise, your muscles aid the amount of blood returned to the heart by contracting with more force around the blood vessels. This causes the blood to easily resist the forces of gravity and return quickly to the heart for re-oxygenation and re-circulation. When you stop exercising quickly, the muscles are no longer contracting against your blood vessels – gravity causes the blood to pool in the lower extremities. When this occurs, you may feel faint or dizzy or experience a loss of consciousness.
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