lecture 12

Question 1

tunica intima

Answer 1

• innermost layer made up of endothelial cells
• separated by the basal lamina from the subendothelial layer
• separated from tunica media by a layer of elastic fibers called the internal elastic lamina which has fenestrations that allow for diffusion

Question 2

tunica media

Answer 2

• consists of primarily smooth muscle cells
• in arteries, extends from internal elastic lamina to the external elastic lamina

Question 3

tunica adventitia

Answer 3

• composed of connective tissue
• vasa vasorum, supply the vessel’s wall

Question 4

innervation of blood vessels

Answer 4

unmyelinated sympathtic nerve fibers that use NE for vasoconstriction

Question 5

continuous capillary

Answer 5

• numerous pinocytotic vesicles (except in nervous tissue) , but no fenestrae
• found in muscle, connective tissue, exocrine glands, and nervous tissue

Question 6

fenestrated capillary

Answer 6

• large openings called fenestrae in their cytoplasm
• covered by thin diaphragms
• found in kidney, intestine, and endocrine glands

Question 7

sinusoidal capillaries

Answer 7

• greatly dilated lumen, basal lamina is discontinuous
• found in liver, bone marrow, and spleen