MICROANATOMY

Detailed explanation-1: -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.

Detailed explanation-2: -During activity, blood pressure increases as the demand for oxygen to be delivered to the working muscles rises. In order to meet the rise in demand of oxygen to be delivered, an increase in capillaries occurs. Capillaries are small blood vessels that help transport blood to and from muscles within the body.

Detailed explanation-3: -Vasodilation of the arterial tree results in increased blood flow, which carries more oxygen to the tissues per unit time. In addition, the enhanced blood flow increases microvessel hematocrit, which also supports increased oxygen delivery to the active muscles (Figure 10).