Chapter 20 test

Question 1

Blood normally flows into a capillary bed from
A. the distributing arteries
B. the conducting arteries
C. a metarteriole 
D. a through fare channel
E. the venules

Answer 1

C. a metarteriole

Question 2

Plasma solutes enter the tissue fluid most easily from
A. continuous capillaries
B. fenestrated capillaries
C. arteriovenous anastomoses
D. collateral vessels
E. venous anastomoses

Answer 2

B. fenestrated capillaries

Question 3

A blood vessel adapted to withstand a high pulse pressure would be expected to have 
A. an elastic tunica media
B. a thick tunica interna
C. one-way valves
D. a flexible endothelium
E. a rigid tunica media

Answer 3

A. an elastic tunica media

Question 4

The substance most likely to cause a rapid drop in blood pressure is
A. epinephrine
B. norepinephrine
C. angiotensin II
D. serotonin
E. histamine

Answer 4

E. histamine

Question 5

A person with a systolic blood pressure of 130 mm Hg and a diastolic pressure of 85 mm Hg would have a mean arterial pressure of about
A. 85 mm Hg
B. 100 mm Hg
C. 108 mm Hg
D. 115 mm Hg 
E. 130 mm Hg

Answer 5

B. 100 mm Hg

Question 6

The velocity of blood flow decreases if
A. vessel radius increases
B. blood pressure increases
C. viscosity increases
D. afterload increases
E. vasomotion decreases

Answer 6

C. viscosity increases

Question 7

Blood flows faster in a venule than in a capillary because venules
A. have one-way valves
B. exhibit vasomotion
C. are closer to the heart
D. have higher blood pressure
E. have larger diameters

Answer 7

E. have larger diameters

Question 8

In a case where interstitial hydrostatic pressure in negative, the only force causing capillaries to reabsorb fluid is
A. colloid osmotic pressure of the blood
B. colloid osmotic pressure of the tissue fluid
C. capillary hydrostatic pressure
D. interstitial hydrostatic pressure
E. net filtration pressure

Answer 8

A. colloid osmotic pressure of the blood

Question 9

Intestinal blood flows to the liver by way of
A. the superior mesenteric artery
B. the celiac truck
C. the inferior vena cava
D. the azygos system
E. the hepatic portal system

Answer 9

E. the hepatic portal system

Question 10

The brain recieves blood from all of the following vessels except the \_\_\_\_\_\_\_ artery or vein.
A. basilar
B. vertebral
C. internal carotid
D. internal jugular
E. anterior communicating

Answer 10

D. internal jugular

Question 11

In some circulatory pathways, blood can get from an artery or a vein without going through capillaries.
T or F

Answer 11

True

Question 12

In some cases, a blood cell may pass through two capillary beds in a single trip from left ventricle to right atrium. T or F

Answer 12

True

Question 13

The body’s longest blood vessel is the great saphenous vein.

Answer 13

True

Question 14

Arteries have a series of valves that ensure a one-way flow of blood. T or F

Answer 14

False=

Some veins have valves, but arteries do not.

Question 15

If the radius of a blood vessel doubles and all other factors remain the same, blood flow through that vessel also doubles.

Answer 15

False=

By the formula F = r^4, the flow increases 16-fold

Question 16

The femoral triangle is bordered by the inguinal ligament, sartorius muscle, and adductor longus muscle. T or F

Answer 16

True

Question 17

The lungs receive both pulmonary and systemic blood. T or F

Answer 17

True

Question 18

If blood capillaries fail to reabsorb all the fluid they emit, edema will occur.

Answer 18

False=

The capillaries normally reabsorb about 85% of fluids they filter; the rest is absorbed by the lymphatic system.

Question 19

An aneurysm is a ruptured blood vessel. T or F

Answer 19

False=

An aneurysm is a weak,bulging vessel that may rupture.

Question 20

In the baroreflex, a drop in arterial blood pressure triggers a corrective vasodilation of the systemic blood vessels. T or F

Answer 20

False=

The response to falling BP is a corrective vasoconstriction.