physiology of the haert

Question 1

what is the path of the intrinsic conduction system?

Answer 1

SA node to AV node to AV bundle to bundle branches to Purkinje fibers

Question 2

how does deoxygenated blood flow through the heart?

Answer 2

body tissues to superior vena cava to right atrium to right ventricle to pulmonary arteries to lungs (to pick up more oxygen and drop off carbon dioxide)

Question 3

how does oxygenated blood flow through the heart?

Answer 3

from lungs to pulmonary veins to left atrium to aorta (to drop off oxygen to the rest of the body)

Question 4

what is another name for the SA node?

Answer 4

cardiac pacemaker

Question 5

what are the stages of diastole (relaxation of the heart)?

Answer 5

atrial contraction (ventricles fill w/ blood), av valves close making “lub” sound

Question 6

what are the stages of systole (contraction of the heart)?

Answer 6

isovolumetric contraction (vents are contracting w/ all valves closed), ejection phase, semilunar valves close, isovolumetric relaxation

Question 7

what is cardiac output?

Answer 7

heart rate x stroke volume

Question 8

what is stroke volume & what is it affected by?

Answer 8

volume of blood pumped out by a ventricle in a heart beat, exercise (additional blood return from muscles)

Question 9

what is heart rate & what is it affected by?

Answer 9

number of times the heart beats per minute, stress, hormones, physical factors