Lecture 6: Circulatory System

Question 1

Which of the statements about the flow of blood through the systemic circulation is TRUE?

a. The pressure on the venous side is much higher than the pressure on the arterial side.
b. Diastole is the pressure from the heart pushing the blood through vessels.
c. Capillaries are always open and flow is controlled in the venules.
d. Entering the capillary bed, there is a very high fluid resistance.

Answer 1

d. Entering the capillary bed, there is a very high fluid resistance.

Question 2

Order the layers of the heart from superficial to deep.
myocardium
visceral pericardium
parietal pericardium
endocardium

a. 3, 2, 1, 4
b. 2, 3, 1, 4
c. 3, 1, 2, 4
d. 1, 2, 3, 4

Answer 2

a. 3, 2, 1, 4

Question 3

What vessels hold the largest percentage of the blood supply?

a. artery
b. arteriole
c. capillary
d. vein

Answer 3

d. vein

Question 4

An elastic artery:

a. Is highly branched.
b. Has primarily muscle and a thin internal elastic membrane.
c. Is small.
d. Has many layers of fenestrated elastin in its tunica media.

Answer 4

d. Has many layers of fenestrated elastin in its tunica media.

Question 5

Exposing the body to conditions that would trigger release of erythropoietin would also likely cause secretion of __________ in many tissues:

a. Sox-9
b. VEGF
c. WTF
d. BMP
e. FGF

Answer 5

b. VEGF

Question 6

Mast cells:

a. Migrate in the blood.
b. Are activated allergically.
c. Have a bi-lobed nucleus.
d. Are small.

Answer 6

b. Are activated allergically.

Question 7

During the vascular phase of clotting, the layer of the arteriole wall that is activated is the

a. tunica adventitia.
b. tunica media.
c. tunica intima.
d. tunica externa.

Answer 7

b. tunica media.

Question 8

Diffuse lymphoid tissue differs from that in lymph nodes and spleen because:

a. Diffuse lymphoid tissue has no capsule.
b. Diffuse lymphoid tissue is reticular connective tissue.
c. Diffuse lymphoid tissue has no germinal center.
d. Diffuse lymphoid tissue has sinuses.

Answer 8

a. Diffuse lymphoid tissue has no capsule.

Question 9

Macrophages and dendritic cells “hang out” in higher numbers

a. In the subcapsular sinus of a lymph node.
b. In the germinal centers of the lymphoid nodules.
c. In the open circulation of the spleen before the blood is collected into splenic veins.
d. A and C

Answer 9

d. A and C

Question 10

Larry has a cold. What is going on to cause his lymph nodes to swell?

a. Many macrophages are multiplying in the germinal centers.
b. Many T and B lymphocytes are multiplying in the germinal centers.
c. Many APCs attacking bacteria.
d. Many lymphocyte precursors being born.

Answer 10

b. Many T and B lymphocytes are multiplying in the germinal centers.