cardiac cycle

Question 1

cardiac cycle

Answer 1

one complete contraction and relaxation of the heart

Question 2

systole

Answer 2

contraction phase
blood pushed out of chamber

Question 3

diastole

Answer 3

relaxation phase
chamber fills with blood

Question 4

P wave

Answer 4

atria depolarize then atrial systole occurs

Question 5

QRS complex

Answer 5

ventricles depolarize then ventricular systole occurs

Question 6

T wave

Answer 6

ventricles repolarize then ventricular diastole occurs

Question 7

atrial systole

Answer 7

S.A nodes depolarizes causing a.p to spread to A.V node. right and left atria contracts which cause right and left atrioventricular valves force open as blood is pushed into the ventricles

Question 8

ventricular systole

Answer 8

electrical impluses spreads to A.V bundle to the bundle branches to the purkinje fibers
isoovolutric contraction phase as ventricles begin to contract but no blood ejected yet
as the pressure rises in ventricles the semilunar valves are forced open and blood is ejected into the aorta and pulmonary trunk

Question 9

ventricular diastole

Answer 9

semilunar valves close as pressure rises in aorta and pulmonary trunk
isovolumetric valves close (just ESV in ventricles)

Question 10

ventricular diastole: Passive ventricular filling

Answer 10

low pressure in ventricles pulls blood in from atria through open A.V valves
ventricles fill as they relax until 70% full

Question 11

active ventricular filling

Answer 11

atria contract and push an additional 30% blood into ventricles
A.V valves close as pressure in ventricles rises

Question 12

atria diastole

Answer 12

passive filling of atria as atria relax
occurs during ventricular systole and ventricular diastole