Question

which of the following may occur as the result of cardiorespiratory training?

improved oxygen delivery to muscles
decrease in glycogen stores within muscle
decrease in the number of mitochondria within muscle
less efficient transfer and use of oxygen by muscles

question 5
2 pts
the aerobic system becomes the dominant energy source after about how many seconds in most individuals?

20
60
30
10

Explanation:

Analyze cardiorespiratory training adaptations

Cardiorespiratory training increases stroke volume, capillary density, and mitochondrial density, leading to enhanced oxygen delivery and utilization by active skeletal muscles.

Analyze energy system dominance timelines

During high-intensity exercise, the immediate ATP-PCr system dominates for the first 10–15 seconds, followed by the anaerobic glycolytic system. The aerobic system becomes the primary, dominant energy source for ATP production after approximately 60 seconds of continuous activity.

Answer:

Question 1

• improved oxygen delivery to muscles (Correct answer)
• decrease in glycogen stores within muscle
• decrease in the number of mitochondria within muscle
• less efficient transfer and use of oxygen by muscles

Question 2

• 20
• 60 (Correct answer)
• 30
• 10