**Question:** During acclimatization to high altitude all of the following take place, EXCEPT:

A. Increased production of red blood cells
B. Decreased cardiac output
C. Increased respiratory rate
D. Decreased sweating

**Core Concept:** Acclimatization to high altitude is the process by which the human body adapts to reduced oxygen levels in the environment. This process involves physiological changes to improve oxygen supply to tissues.

**Why the Correct Answer is Right:** Decreased sweating (option D) is not a part of the acclimatization process to high altitude. Sweating helps to regulate body temperature and maintain fluid balance, but it does not directly contribute to improving oxygen supply or counteracting the negative effects of hypoxia.

**Why Each Wrong Option is Incorrect:**

A. Increased production of red blood cells (option A): This is a key component of the acclimatization response, as increased red blood cell production helps to transport more oxygen to tissues.

B. Decreased cardiac output (option B): Acclimatization to high altitude usually results in increased cardiac output as the heart works harder to deliver oxygen to tissues.

C. Increased respiratory rate (option C): Elevated respiratory rate enhances the exchange of oxygen in the lungs, allowing for more efficient oxygen uptake.

**Clinical Pearl:** It is essential for medical students and practitioners to understand the correct physiological responses during acclimatization to high altitude to effectively manage patients in such environments and provide appropriate interventions when necessary.

**Correct Answer:** D. Decreased sweating