At higher altitudes body overcome altitude sickness by increasing

Options

A. Binding capacity of haemoglobin with O2
B. RBCs production
C. Breathing rate
D. Both (2) and (3)

Answer

To solve the question regarding how the body overcomes altitude sickness at higher altitudes, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding Altitude Sickness**:
- At higher altitudes, the atmospheric pressure decreases, leading to lower oxygen availability. This condition can cause altitude sickness, characterized by symptoms such as headache, nausea, and fatigue.

**Hint**: Remember that altitude sickness is primarily due to reduced oxygen levels in the environment.

2. **Body's Response to Low Oxygen**:
- The body has mechanisms to adapt to lower oxygen levels. Two primary responses include increasing the breathing rate and producing more red blood cells (RBCs).

**Hint**: Think about how the body compensates for low oxygen levels—what physiological changes occur?

3. **Increased Breathing Rate**:
- One immediate response to lower oxygen is an increase in the breathing rate. This allows the body to take in more oxygen with each breath, despite the lower concentration in the air.

**Hint**: Consider how breathing more rapidly might help in oxygen uptake.

4. **Increased RBC Production**:
- Over time, the body acclimatizes to high altitudes by increasing the production of red blood cells. More RBCs mean more hemoglobin is available to carry oxygen throughout the body.

**Hint**: Recall the role of red blood cells in oxygen transport and how their increase can help in oxygen delivery.

5. **Binding Capacity of Hemoglobin**:
- While the binding capacity of hemoglobin remains the same, the increased number of RBCs enhances the overall oxygen-carrying capacity of the blood.

**Hint**: Remember that hemoglobin's affinity for oxygen does not change, but the quantity of hemoglobin available does.

6. **Conclusion**:
- Therefore, the body overcomes altitude sickness by increasing both the breathing rate and the production of red blood cells. Thus, the correct answer to the question is **both second and third options**.

### Final Answer:
The body overcomes altitude sickness by increasing **RBC production** and **breathing rate** (Option D: both second and third).