ANATOMY

Detailed explanation-1: -When you are exercising, your muscles need extra oxygen-some three times as much as resting muscles. This need means that your heart starts pumping faster, which makes for a quicker pulse.

Detailed explanation-2: -At the beginning of exercise, your body removes the parasympathetic stimulation, which enables the heart rate to gradually increase. As you exercise more strenuously, the sympathetic system “kicks in” to accelerate your heart rate even more.

Detailed explanation-3: -When you are exercising, the heart’s blood flow increases by around four or five times from when you are at rest. Your body does this for you by increasing the rate of your heartbeat, thus increasing the amount of blood that goes out to the rest of the body. Cardiac output is the rate of blood pumped by the heart.

Detailed explanation-4: -The rise in heart rate during exercise is considered to be due to the combination of parasympathetic withdrawal and sympathetic activation. The fall in heart rate immediately after exercise is considered to be a function of the reactivation of the parasympathetic nervous system.

Detailed explanation-5: -The more the heart beats, the more breathing occurs. As the heart beats faster, it uses more energy and sends more oxygen to the body. If a person is exercising the oxygen is used very quickly in order to provide the muscles with needed energy to move. Thus the heart beats faster to pump more oxygen to the muscles.