Question

why does blood flow increase when exercising? (biological explanation)

Answer 1

Answer:- When you exercise the blood vessels that supply your muscles with blood and take away blood from your muscle dilate to allow massive blood flow to your muscles to increase. When you exercise your body needs large quantities of oxygen, glucose, amino acids, and a molecule called ATP to allow the muscles to contract and function.As the muscles consume nutrients and perform work-related waste materials such as lactic acid are created and need to be removed from the muscles so that they can be metabolized by the liver and discarded or recycled. It is because of this need to bring in vast quantities of materials and eliminate waste products that, during exercise, blood flow increases dramatically.

Or

When you exercise the blood flow is greater because the blood vessels in your muscles dilate. Imagine flowing water through a fire hose when opposed to a garden hose. Adenosine triphosphate, or ATP, is how your body uses biochemicals for energy storage and use.The muscles themselves generate metabolic by-products (for example, adenosine, hydrogen ions, and carbon dioxide) when ATP is used up in working muscles. As these byproducts exit the muscle cells, they cause small, thin-walled blood vessels (capillaries) to expand or dilate within the muscle, which is called vasodilatation.The dilated capillaries allow an increased blood flow, which gives the working muscle more oxygenated blood.