Section 2 Lecture 4 Flashcards Preview

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Flashcards in Section 2 Lecture 4 Deck (36):
1

Change in pressure from pulmonary artery to the left atrium:

15 mmHg

2

Change in pressure from aorta to the right atrium:

90 mmHg

3

ventricular filling happens during which phase of the cardiac cycle?

diastolic phase

4

What valves are open and which closed during ventricular filling (diastolic phase)?

The AV valves are open and the semilunar valves are closed

5

How much does each ventricle take in with each filling cycle?

140 ml (cc)

6

T or F? The ventricle fills in a linear fashion during diastole.

F.

7

What valves are open and which closed during ventricular ejection (systolic phase)?

The AV's valves must be closed and semilunar open

8

Avg SV:

70 cc

9

Ejection fraction for the avg person:

0.5 (70/140)

10

How much blood is typically left in the ventricle after contraction?

70 cc

11

Is there a larger change in pressure during unstressed volumetric change or stressed volumetric change?

stressed (passive tension)

12

What is the first sound heard, the "lub?"

mitral valve closing

13

What is the second sound heard, the "dub?"

aortic valve closing (semilunar)

14

The A-V valve is bw:

the right atrium and right ventricle

15

SV =

EDV - ESV

16

Ejection Fraction =

SV/ EDV

17

initiate IV contraction occurs at this point in the ECG:

R

18

normal systole in an ECG:

Bw beg of R and end of T

19

diastole in an ECG:

T to R (including P) wave

20

the Ap that ignites system is found at this point of the ECG:

P wave

21

Returning to resting state in an ECG:

T wave

22

The only time that the ventricular P is higher than the aortic?

ejection

23

When is atrial P lower than ventricular?

isovolumetric contraction, ejection, and isovolumetric relaxation

24

When is atrial P higher than aortic P?

never

25

The mitral valve closes at the:

end of atrial systole/ beginning of isovoumetric contraction

26

The aortic valve opens at the:

end of isovoumetric contraction/ beginning of ejection

27

The aortic valve closes at the:

end of ejection / beginning of isovolumetric relaxation

28

The mitral valve closes at the:

end of isovolumetric relaxation/ beginning of rapid inflow

29

When is aortic pressure higher than ventricular?

always except for during ejection

30

When do the bicuspid and tricuspid valves close, in terms of pressure gradients?

when the atrial pressure falls below aortic pressure

31

Isovolumetric contraction occurs between these 2 points of the ECG:

R and S

32

Atrial systole occurs bw these 2 points on the ECG:

bw P and R

33

Ejection occurs bw these 2 points on the ECG:

S to after the T wave

34

How much extra volume is pushed into the ventricle with each cycle, what percent of the normal filling stroke?

5-10%

35

What is the beginning of systole initiated by:

R wave

36

Stroke volume is measured bw what two points on the ECG?

S to after the T wave