Key Area 6 The cardiac cycle

Question 1

Parasympathetic nerves to the heart

Answer 1

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

Question 2

Ventricular systole

Answer 2

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

Question 3

Ventricular diastole

Answer 3

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

Question 4

systole

Answer 4

part of the cardiac cycle in which cardiac muscle is contracted

Question 5

Sympathetic accelerator nerve

Answer 5

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

Question 6

Stroke volume

Answer 6

volume of blood expelled from one ventricle during one cardiac cycle

Question 7

Stroke

Answer 7

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

Question 8

Sphygmomanometer

Answer 8

instrument used to measure blood pressure

Question 9

Semi-lunar valves

Answer 9

valves leading into the main arteries leaving the heart

Question 10

Sino-atrial node (SAN)

Answer 10

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

Question 11

What is the equation for calculating cardiac output

Answer 11

CO = SV x HR