Deck 40: Vascular Function: Hemodynamics

Question 1

You r Pro fes sor 's stro ke volum e at re st is 90 m L (be cau se h e ha s a b ig hea rt - believe it or not).s

A) Increases to about 150 mL
B) Increases to about 120 mL
C) Decreases to about 60 mL
D) Is unchanged
E) Can't be determined because sympathetic stimulation constricts the veins

Answer 1

B

Question 2

If the flow through an artery obeys Poiseuille's law, decreasing the radius of an artery by a factor of 2 s ho uld

A) Increase the res istance by a factor of 2
B) Increase the res istance by a factor of 4
C) Increase the res istance by a factor of 8
D) Increase the resistance by a factor of 16
E) Decre ase the resistance by a factor of 8

Answer 2

D

Question 3

The ratio of venous to arterial compliance is about

A) 0.05
B) 0.1
C) 1
D) 10
E) 20

Answer 3

E

Question 4

The com pliance of the aorta and major arteries

A) Is DEFINED as C = 6 P / ( wr4/ 8yl)
B) Along w ith the strok e vo lum e, dete rmin es th e pu lse pre ssu re
C) Determines the afterload
D) Determines the preload
E) Causes the aortic notch

Question 5

Which of the following is NOT one of the functions of the vasculature?

A) Vo lum e re se rvo ir
B) Exchange of materials in the tissues
C) Distribute flow to the organs
D) Contain the blood
E) Fight off viral and bacterial infections

Question 6

Blood pressure is measured clinical by a device called

A) Sphygmo manom eter
B) Mercury tonometer
C) Air puff tonometer
D) Doppler sonometer
E) Mercury barometer

Question 7

Com pliance is DEFINED as

A) C = 6 V / 6 P
B) C = Q V / R
C) C = 6 P / R
D) C = 8 y L / w r4 6 V / Q
E) C = V

Question 8

The dicrotic notch is caused by

A) The closure of the pulm onary valve
B) C on tra ctio n o f th e le ft ve ntr icle
C) Closure of the aortic valve
D) Reflection of the pressure wave off the peripheral arteries
E) Closure of the triscupid valve

Question 9

The difference in tim e between ejection of blood and the first Korotkoff soun d in the brachial artery at th e a nte cu bita l fos sa is about (c ho os e th e b es t an sw er - ob vio us ly no ne are righ t on the m on ey)

A) 1 ms
B) 0.01 s
C) 0.1 s
D) 1 s
E) 5 s

Question 10

The difference betwe enlate ra l and end pressure is

A) Due to the equivalent pressure of the kinetic energy of the blood
B) Zero in all parts of the vasculature
C) Due to the hydrostatic pressure in the vasculature
D) Due to the PV work do ne by the heart
E) Maximum at zero flow

Question 11

During a routine blood press ure m easurem ent, the external pressure im posed on the radial artery is just a little lower than the systolic pressure. Blood squirts through the artery and produces a noise called the

A) First heart sound
B) Second heart sound
C) First Korotkoff sound
D) Br uit
E) Second Korotkoff sound

Question 12

The m uffling or disappearance of the Korotkoff sound occurs at a pressure corresponding to the

A) Average arterial pressure
B) Dias tolic pre ssu re
C) Systolic pressu re
D) Dicrotic notch
E) Pulse pressure

Question 13

Flow velocity in the vasculature is greatest in the

A) Large arteries because pressure is highest
B) Sm allest vessels because total cross-sectional area is lowest
C) Veins because compliance is least
D) Large arteries because total cross-sectional area is least
E) Sm allest vessels because the pressure gradient is greatest

Question 14

The velocity of the pressure pulse in a normal adult is about

A) 0.05 m s-1
B) 0.5 m s-1
C) 5 m s-1
D) 50 ms-1
E) 500 m s-1

Question 15

The largest pressure drop in the circulation occurs in the

A) Large arteries
B) Arterioles
C) Capillaries
D) Venules
E) Lareg veins

Question 16

Which of the following is NOT one of the assumptions for Poiseuille flow?

A) Flow is turbulent
B) T he tub e is rigid
C) The tube is a right circular cylinder
D) The fluid is Newtonian
E) T he re is n o "s lipp ag e" at th e w all