2. During exercise, your muscles need more
energy from respiration in order to contract. So
the heart beats faster and arteries supplying
muscles dilate.
3. These changes increase the blood flow to
muscles and result in
•An increase in supply of oxygen and glucose for
respiration.
•An increase in removal of carbon dioxide
http://www.youtube.com/watch?v=O8ttt3M8qZM
4. You can detect the flow of blood through
arteries as a pulse. Each time the left ventricle
beats, a wave passes along the arteries which
you can feel. You can find your pulse by feeling
an artery at your wrist. The number of pulses
per minute is your pulse rate and this is the
same as the heart rate.
