Key Area 6 The cardiac cycle

nerve fibres which result in a decrease in heart rate; part ofthe automatic nervous system (ANS)

part of the cardiac cycle in which the cardiac muscle of the ventricles contracts

part of the cardiac cycle in which the cardiac muscle of the ventricles relaxes

part of the cardiac cycle in which cardiac muscle is contracted

nerve fibre that stimulates an increase in heart rate; part of the autonomic nervous system (ANS)

volume of blood expelled from one ventricle during one cardiac cycle

life threatening condition that occurs when blood supply to part of the brain is cut off

instrument used to measure blood pressure

valves leading into the main arteries leaving the heart

region of nervous tissue in the wall of the right atrium;receives impulses from the medulla

CO = SV x HR