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