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Why do muscles need more blood while exercise?

When you exercise, you increase the amount of blood flowing to and from your muscles so that more oxygen is supplied to complete aerobic respiration.

Why do muscles need blood?

The circulatory system is closely associated with skeletal muscle to provide efficient transfer of oxygen and nutrients required for contraction and the removal of inhibitory waste products. At rest, skeletal muscle uses approximately 20% of cardiac output, which can rise to 80% during exercise.

Do muscles need more blood?

Exercising muscles need more blood. And in response to regular exercise, they actually grow more blood vessels by expanding the network of capillaries. In turn, muscle cells boost levels of the enzymes that allow them to use oxygen to generate energy.