Deck 8: Cardiovascular System

Question 1

Fenestrae are structures that:

A) Allow communication between smooth muscle cells otherwise separated by an elastic lamina in the tunica media
B) Allow for the diffusion of molecules between the cytoplasm of the endothelium and underlying smooth muscle cells
C) Anchor the bases of valves to the endothelium of lymphatic vessels
D) Carry electrical impulses in the endocardium of the heart
E) Penetrate through the cytoplasm of endothelial cells of capillaries

Answer 1

E

Question 2

A blood vessel with a regular,round profile in cross section,a diameter of about 100 $\mu$ m,and one to two layers of smooth muscle would be classified as a(n):

A) Arteriole
B) Capillary
C) Elastic artery
D) Muscular artery
E) Venule

Answer 2

Arteriole

Question 3

Pericytes are contractile cells found in which location?

A) Adherent to smooth muscle cells in the tunica media of arterioles
B) Adjacent to the surfaces of capillaries
C) Exclusively in elastic arteries
D) Within the tunica intima of veins
E) Within valves of lymphatic vessels

Answer 3

B

Question 4

Weibel-Palade bodies containing the procoagulant protein von Willebrand's factor are found in:

A) Endothelial cells of the tunica intima
B) Fibroblasts of the tunica adventitia
C) Macrophages of the tunica intima
D) Nerve endings in the tunica adventitia
E) Smooth muscle cells of the tunica media

Question 5

Which vessel layer is the thickest in a histologic section of the vena cava?

A) External elastic lamina
B) Internal elastic lamina
C) Tunica adventitia
D) Tunica intima
E) Tunica media

Question 6

A blood vessel seen under the microscope has a tunica intima that is 10 $\mu$ m thick,a tunica media that is 100 $\mu$ m thick,and a tunica adventitia that is 40 $\mu$ m thick.Which type of blood vessel is this?

A) Capillary
B) Muscular artery
C) Sinusoid
D) Venule
E) Vein

Question 7

Aortic aneurysms are a serious symptom present in Marfan's syndrome.They result from an improper function of:

A) Elastic laminae produced by smooth muscle cells
B) Gap junctions between cells of the tunica intima and tunica media
C) Reticular fibers in the tunica intima
D) Tight junctions of endothelial cells
E) Vasa vasorum of the tunica adventitia