cardiac cycle

Question 1

where is blood oxygenated?

Answer 1

lungs

Question 2

what brings oxygenated blood back to the heart?

Answer 2

pulmonary vein

Question 3

whats the left AV?

Answer 3

left atrioventricular valve (bicuspid - 2 flaps)

Question 4

whats the right AV?

Answer 4

right atrioventricular valve (tricuspid - 3 flaps)

Question 5

what does the aorta do?

Answer 5

carries oxygenated blood to the muscles and organs

Question 6

how does blood get to the aorta?

Answer 6

through the left ventricle

Question 7

what enters the right atrium and what blood vessel is used?

Answer 7

deoxygenated blood enters the right atrium through the vena cava

Question 8

where is deoxygenated blood forced out of and into what?

Answer 8

forced out of the right ventricle and into the pulmonary artery

Question 9

where does the pulmonary artery carry the blood to and why?

Answer 9

to the lungs for oxygenation

Question 10

cardiac cycle

Answer 10

cardiac muscle contraction and blood moving through the chambers 1 complete cardiac cycle = 1 heart beat

Question 11

diastole

Answer 11

relaxing/filling

Question 12

systole

Answer 12

contraction/emptying

Question 13

SL valve

Answer 13

separates arteries from ventricles

Question 14

atrial diastole (0.4 secs)

Answer 14

blood enters the atrium and pressure builds with more blood

Question 15

ventricular diastole

Answer 15

pressure forces AV valves open approx 70% blood moves into ventricles (passive filling)

Question 16

atrial systole (ventricular diastole active filling) (0.1 secs)

Answer 16

atria contracts forces remaining blood into ventricle once filled AV valves prevent backflow

Question 17

ventricular systole (0.3 secs)

Answer 17

ventricles contract forcing blood out of the heart and into veins/arteries

Question 18

what’s myogenic?

Answer 18

generates its own pulse the heart is myogenic

Question 19

sinoatrial node(SA node)

Answer 19

cardiac cells located in the right atrium walls emits an impulse

Question 20

where does the impulse from the SA node spread to?

Answer 20

adjacent interconnecting fibers of the left atrium AV nodes (atrioventricular nodes)

Question 21

where does the AV nodes distribute the signal/action potential to?

Answer 21

to the Bundle of His (BoH) there’s a 0.1 dec delay called the relay signal allowing full atrial contraction