問題一覧
1
The pressure within a vein is
Directly proportion to the force on the vein wall from the blood volume in the vein
2
The part of the vessel wall that is a single layer of cells backed by a thin layer of elastin and collagen is
Intima
3
When red blood cells cling together to form clumps in areas of slow flow it is called
Rouleaux formation
4
Exercise usually ___________ flow
Increases
5
16
d
6
Blood flow and pressure are not significantly compromised until _______ of cross sectional area is eliminated?
75%
7
3
b
8
The anatomy of arteries includes all of the following EXCEPT
Internal capsule
9
17
b
10
The velocity of flow is __________ related to the cross-sectional area (size) of a vessel
Inversely
11
The physiology of circulation is called
Hemodynamics
12
Venous valves are formed in which layer?
Intima
13
Which of the following is NOT true about the Reynolds number?
Is not included in the principles of fluid dynamics
14
The artery with the smallest radius will have _____ if the other factors are all the same.
Higher resistance to flow
15
Which term describes the contraction or narrowing of the vessel lumen?
Vasoconstriction
16
8
c
17
20
b
18
10
a
19
During inspiration (inhale) the intra-abdominal (below the diaphragm) pressure _______ so venous flow _____
Increases, increases
20
Following a significant stenosis, the swirling motion is called
Vortices
21
The resistive index is used to quantify
Resistance
22
15
b
23
1
d
24
Blood pressure is
Pressure of the blood on the vessel wall
25
If a patient has normal arterial waveforms with low velocities in the vessels, which is most likely?
Low cardiac output
26
9
d
27
Blood flow in concentric layers with the highest velocity in the center of the vessel is
Laminar flow
28
Veins and arteries are different in all of the following EXCEPT
Veins have thicker walls with a very little muscle
29
14
c
30
The normal dynamic venous pressure in the venules is 15 to 20 mmHg. What is the pressure in the rt atrium?
0 mmHg (within the rt atrium and is called the central venous pressure)
31
A normal venous signal is described as
Phasic
32
Turbulence in flow following (distal to) a narrowing in the vessel is
Post stenotic turbulence
33
Which layer of the artery is the muscle layer?
Media
34
5
b&c
35
Normal venous characteristics include all EXCEPT
Continuous signal through respiration
36
12
d
37
4
d
38
7
a
39
The principle that states that blood flow from one point to another because of an energy gradient and is slowed by resistance is
Poiseuille’s Law
40
The principle factors affecting blood volume changes are
Cardiac output and peripheral resistance
41
A color bruit will most likely be imaged when there is
Turbulent flow distal to a significant stenosis
42
The outermost layer of the vessel wall is
Tunica adventitia
43
The highest systolic velocity is located at
The narrowest portion of the stenosis
44
Flow information from a specific location is obtained by using the
Sample volume of the range gate
45
Laminar flow becomes disturbed when the Reynolds number is higher than
2000
46
18
a
47
Which of the following is NOT found in normal veins?
Pulsatility
48
2
e
49
6
b
50
Factors that influence a critical stenosis are
All of the above
51
11
b
52
13
a
53
19
d