What happens within the body's circulatory system during exercise?

Answer 1

When you exercise, you work your muscles, including your heart. The faster your heart rate gets while exercising, the less it has to work, and the healthier you get. I assume, since your heart beats faster, your blood circulates faster. Basically, if your blood circulates faster, it brings more oxygen to your muscles so they won't tire out. Your circulatory system works the same, just faster.

EDIT: A healthy heart actually beats SLOWER because the body doesn't have to work that hard to circulate the blood throughout the body.

It's harder for people with healthy hearts to get their heart rates up during exercise, on the other hand it's easier for heavier/unhealthy people to get the rate up. This is why heavier people tend to lose weight easier than thin people.

Answer 2

It depends on what type of exercise the person is doing. There are low and High intensity aerobics, non-aerobic weight lifting. Think of your body as a car. To go faster you burn more fuel (glucose), you need higher air intake through the carburator(lungs), you need coolant to maintain safe operating temperature (blood stream), you need a faster working fluid pump (heart). The diffenence between weight lifting and low intense aerobics is that they are slower and thus can burn more slow processed fats. Glucose(sugar) is a faster processed fuel for high intense activity, and that is why you need to carb load for them.

Answer 3

During exercise, the heart rate increases to pump more oxygen-rich blood to the muscles. This increased blood flow helps deliver nutrients and oxygen to the muscles and remove waste products like carbon dioxide. Blood vessels also dilate to allow for better circulation and heat dissipation.