How the man's respiration will be affected if he ascends a height of 25000 feet

Options

A. No effect on respiration
B. Respiratory rate will be decreased
C. Respiratory rate will be increased
D. Anything can happen

Explanation

**Step-by-Step Solution:**

1. **Understanding Altitude Effects on Respiration:**
- At higher altitudes, the atmospheric pressure decreases, which leads to a lower partial pressure of oxygen. This means that there is less oxygen available for the body to use during respiration.

2. **Immediate Response to High Altitude:**
- When a person ascends to a height of 25,000 feet, the body immediately senses the decrease in oxygen levels. This is primarily detected by specialized chemoreceptors known as carotid bodies located in the neck.

3. **Increased Respiratory Rate:**
- In response to the low oxygen levels, the body increases the respiratory rate. This is an attempt to take in more oxygen to meet the body's metabolic needs. Therefore, the immediate effect of ascending to such a height is an increase in the rate of breathing.

4. **Acclimatization:**
- Over time, the body can undergo acclimatization, which involves physiological adjustments to cope with the lower oxygen levels. This may include an increase in red blood cell production to enhance oxygen transport in the blood.

5. **Conclusion:**
- In summary, when a man ascends to a height of 25,000 feet, his respiration will be affected by an increase in respiratory rate due to the lack of oxygen sensed by the carotid bodies.

**Final Answer:**
The man's respiration will be affected by an increase in respiratory rate due to the decreased availability of oxygen at high altitudes.

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