Section 2 Lecture 4 Flashcards Preview

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

Change in pressure from pulmonary artery to the left atrium:

A

15 mmHg

2
Q

Change in pressure from aorta to the right atrium:

A

90 mmHg

3
Q

ventricular filling happens during which phase of the cardiac cycle?

A

diastolic phase

4
Q

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

A

The AV valves are open and the semilunar valves are closed

5
Q

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

A

140 ml (cc)

6
Q

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

A

F.

7
Q

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

A

The AV’s valves must be closed and semilunar open

8
Q

Avg SV:

A

70 cc

9
Q

Ejection fraction for the avg person:

A

0.5 (70/140)

10
Q

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

A

70 cc

11
Q

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

A

stressed (passive tension)

12
Q

What is the first sound heard, the “lub?”

A

mitral valve closing

13
Q

What is the second sound heard, the “dub?”

A

aortic valve closing (semilunar)

14
Q

The A-V valve is bw:

A

the right atrium and right ventricle

15
Q

SV =

A

EDV - ESV

16
Q

Ejection Fraction =

A

SV/ EDV

17
Q

initiate IV contraction occurs at this point in the ECG:

A

R

18
Q

normal systole in an ECG:

A

Bw beg of R and end of T

19
Q

diastole in an ECG:

A

T to R (including P) wave

20
Q

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

A

P wave

21
Q

Returning to resting state in an ECG:

A

T wave

22
Q

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

A

ejection

23
Q

When is atrial P lower than ventricular?

A

isovolumetric contraction, ejection, and isovolumetric relaxation

24
Q

When is atrial P higher than aortic P?

A

never

25
Q

The mitral valve closes at the:

A

end of atrial systole/ beginning of isovoumetric contraction

26
Q

The aortic valve opens at the:

A

end of isovoumetric contraction/ beginning of ejection

27
Q

The aortic valve closes at the:

A

end of ejection / beginning of isovolumetric relaxation

28
Q

The mitral valve closes at the:

A

end of isovolumetric relaxation/ beginning of rapid inflow

29
Q

When is aortic pressure higher than ventricular?

A

always except for during ejection

30
Q

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

A

when the atrial pressure falls below aortic pressure

31
Q

Isovolumetric contraction occurs between these 2 points of the ECG:

A

R and S

32
Q

Atrial systole occurs bw these 2 points on the ECG:

A

bw P and R

33
Q

Ejection occurs bw these 2 points on the ECG:

A

S to after the T wave

34
Q

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

A

5-10%

35
Q

What is the beginning of systole initiated by:

A

R wave

36
Q

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

A

S to after the T wave