exercise means using energy, using energy means using more oxygen for energy production. Because of this the heart needs to beat faster, and the lungs need to work faster to supply the oxygen need of the body
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Exercise places stress on the body and in response, your brain will release messenger molecules to tell your heart to pump blood faster, hence a increased pulse rate.
References :
when exercising the muscles work harder and therefore need more oxygen to get more oxygen the muscles need to have more blood passing through, so the heart rate goes up to pump blood to the muscles faster.
References :
exercise means using energy, using energy means using more oxygen for energy production. Because of this the heart needs to beat faster, and the lungs need to work faster to supply the oxygen need of the body
References :