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Single Answer MCQ
Q-00020187

How does physical activity affect the circulatory system?

1

Decreases heart rate at rest

2

Increases hemoglobin levels

3

Raises LDL cholesterol

4

Shrinks the size of the heart

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Sandeep Chaturvedi

Sandeep Chaturvedi

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Answer and Solution

Answer

B. Increases hemoglobin levels

Solution:

Physical activity increases the number of red blood cells and hemoglobin levels, enhancing oxygen transport. The other options are incorrect as regular exercise can decrease heart rate and promote the production of HDL cholesterol.

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