unit 3; cardiac cycle

Question 1

what is systole

Answer 1

the contraction of the heart muscles

Question 2

what is diastole

Answer 2

relaxation of the heart muscles

Question 3

what happens during diastole

Answer 3

atria are relaxed and fill with blood, ventricles are also relaxed

Question 4

what happens during atrial systole

Answer 4

atria contract, pushing blood into ventricles, ventricles remain relaxed

Question 5

what happens during ventricular systole

Answer 5

atria relax, ventricles contract, blood is pushed through pulmonary arteries and aorta

Question 6

describe atrioventricular valves

Answer 6

between atriums and ventricles- prevents backflow of blood

Question 7

describe semi-lunar valves

Answer 7

in aorta and pulmonary artery, prevent backflow into ventricles

Question 8

describe pocket valves

Answer 8

in veins, ensures blood flow back towards the heart not away from it

Question 9

what is the equation for cardiac output

Answer 9

heart rate X stroke volume (volume of blood pumped out with each beat)