Question

question
why did the pulse rate decrease 5 minutes after exercise?
five minutes after exercising our hearts are more efficient at pumping blood.
the tissue demand for oxygen has increased.
the tissue demand for oxygen has decreased.
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pulse rate (pulses/15sec) pulse rate (beats/min)
20 80
18 72
24 96
22 88
33 132
23 92

Explanation:

• Analyze Option 1: Heart efficiency post - 5 - minute exercise doesn't directly explain the immediate decrease in pulse rate right after exercise stops. The body's recovery process related to oxygen demand is more relevant.
• Analyze Option 2: If tissue oxygen demand increased, the heart would pump faster (higher pulse rate) to meet the demand, which is the opposite of a decreased pulse rate.
• Analyze Option 3: After exercise, the body's activity level drops, so the tissue demand for oxygen (which drives the heart to pump more during exercise) decreases. As a result, the heart doesn't need to beat as fast, so the pulse rate decreases.

Answer:

C. The tissue demand for oxygen has decreased.