Basic and Clinical Sciences (BCSE) Practice Exam

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During acclimatization, what happens to the vascularity of tissues?

  1. It decreases significantly

  2. It remains unchanged

  3. It increases

  4. It fluctuates

The correct answer is: It increases

During acclimatization, especially when considering changes in environmental conditions such as altitude or temperature, an increase in vascularity of tissues is a key adaptation. This physiological response is primarily aimed at enhancing oxygen delivery and improving thermoregulation. In instances such as exposure to high altitudes, the body responds by increasing the number and distribution of capillaries in tissues, which facilitates greater oxygen uptake and transport. This increase in capillary density allows for more efficient diffusion of oxygen from the blood to the tissues, compensating for the reduced oxygen availability in the atmosphere. Additionally, increased vascularity aids in the removal of metabolic waste products, supporting overall metabolic function. Thus, the correct understanding of acclimatization involves recognizing that the body makes significant adjustments, including vascular changes, to maintain homeostasis and optimize performance under new environmental stressors.