heart 2

Question 1

stroke volume

Answer 1

the amount of blood ejected by each ventricle during a single beat - avg 80ml

Question 2

stroke volume =

Answer 2

end diastolic volume - end systolic volume

EDV - ESV

Question 3

diastole

Answer 3

relaxation of heart ventricles to fill

Question 4

systole

Answer 4

a period of contraction in a chamber of the heart as part of the cardiac cycle

Question 5

dicrotic notch

Answer 5

a valley in the pressure tracing caused by the elastic arterial walls recoiling after lunar valves close

Question 6

left and right coronary arteries originate

Answer 6

base of aorta

Question 7

infarction

Answer 7

an area of dead cells due to lack of blood flow

Question 8

shortest circulatory route

Answer 8

coronary circulation 8 seconds

Question 9

largest blood vessel

Answer 9

inferior vena cava

Question 10

intrinsic conductive system

Answer 10

ability of the cardiac muscle to contract on its own in the absence of neural or hormonal stimulation

Question 11

sinoatrial node

Answer 11

contains pacemaker cells which establish the heart rate

Question 12

atrioventral node

Answer 12

delays signal and relays to apex to initiate contraction

Question 13

ekg waves

Answer 13

electricity chart of heart p, q, r, s, t

Question 14

p wave

Answer 14

depolarization of the atria

Question 15

qrs complex

Answer 15

depolarization of the ventricles (repolarization of atria masked)

Question 16

t wave

Answer 16

ventricles repolarize

Question 17

isovolumentric contraction

Answer 17

period of ventricle contraction after av valves have closed but semilunar valves have not yet opened

Question 18

Cardiac output

Answer 18

Stroke volume x pulse (amount of blood that can be pumped in one minute)

Question 19

Mean Arterial Pressure (MAP)

Answer 19

((systolic-diasolic)x .3) + diastole

Question 20

lubb

Answer 20

sound of AV valves closing

Question 21

dubb

Answer 21

sound of semilunar valves closing

Question 22

parasympathetic ACH’s affect on heart rate

Answer 22

slows

Question 23

sympathetic affect on heart rate

Answer 23

NE - increase; NE and E in blood increase longer lasting

Question 24

sympathetic affect on stroke volume

Answer 24

increases volume - greater force results in lower end systolic volume increasing stroke vol

Question 25

cutting vagus nerve

Answer 25

increases heart rate