What is an immediate effect of cardiorespiratory endurance exercise?

Question

BlackTom AI · Accepted Answer

During cardiorespiratory endurance exercise, oxygen consumption increases because working skeletal muscles demand more ATP and require greater oxygen delivery to support aerobic metabolism.

1. Relevant knowledge points and concepts
- Cardiorespiratory endurance exercise (e.g., running, cycling) stresses the heart, lungs, and circulatory system to supply oxygen to working muscles.
- Key physiological responses: increased heart rate, increased stroke volume, increased cardiac output, and increased pulmonary ventilation (breathing rate and depth).
- Cellular requirement: aerobic ATP production in mitochondria depends on oxygen; higher work rate → higher VO2 (oxygen consumption).
- Acute redistribution of blood flow reduces digestive activity to prioritize muscles.

2. Step-by-step reasoning
- Exercise raises muscle ATP demand. To meet that demand aerobically, muscles require more O2.
- The lungs increase ventilation to bring in more O2 and remove CO2.
- The heart increases output (HR × stroke volume) to transport the increased O2 to muscles.
- The combined increase in ventilation and cardiac output produces a measurable rise in whole-body oxygen consumption (VO2).

3. Intermediate steps / calculations
- While no numerical values are given, conceptually: VO2 = cardiac output × arteriovenous O2 difference. During exercise both cardiac output and O2 extraction increase, so VO2 rises.
- Example (conceptual): If cardiac output doubles and O2 extraction increases modestly, VO2 increases substantially.

4. Why the correct answer is correct
- "Increased oxygen consumption" directly follows from elevated metabolic rate and enhanced cardiovascular/pulmonary activity during endurance exercise; it is the immediate and primary physiological change.

5. Why the other options are incorrect
- "Decreased ATP production": incorrect — ATP production increases (ATP turnover rises) to fuel muscle work.
- "Increased digestive activity": incorrect — blood is shunted away from the gut; digestive activity typically decreases acutely.
- "Decreased pulmonary ventilation": incorrect — ventilation increases to meet elevated O2 demand and clear CO2.

6. Conclusion
Therefore, the immediate effect of cardiorespiratory endurance exercise is increased oxygen consumption, which matches the provided answer.

What is an immediate effect of cardiorespiratory endurance exercise?Single choice

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