Cardiovascular

Question 1

Layers of vessels in to out?

Answer 1

Lumen, intima, media, adventitia

Question 2

Purpose of tunica intima?

Answer 2

Control point for blood flow. Single layer squamous, BL, outer elastic edge.

Question 3

Purpose of tunica media?

Answer 3

Blood pressure and stability. Smooth muscle with external elastic membrane

Question 4

What is the tunica adventitia made of?

Answer 4

Connective tissue and collagen

Question 5

Large elastic artery makeup?

Answer 5

Intima has subendothelial elastic fibers, media is thickest with spiraled smooth muscle, adventitia contains vasa vasorum

Question 6

Muscular artery makeup?

Answer 6

Prominent wavy waxy internal elastic membrane. Little elastic in media, mostly collagen in adventitia

Question 7

Small artery makeup?

Answer 7

Have internal elastic membrane, 3-8 layers in media. Arterioles have 1-2

Question 8

Metarteriole characteristics?

Answer 8

Incomplete smooth muscle, precapillary sphincter

Question 9

Capillaries makeup?

Answer 9

Single layer of endothelial cells. Allows passage of one RBC at a time. Total diameter 800x aorta

Question 10

What are pericytes?

Answer 10

Rouget cells. Contractile stem cells regulated by NO

Question 11

Continuous capillaries?

Answer 11

Muscle and lungs, occluding junctions

Question 12

Fenestrated capillaries?

Answer 12

Have holes, some with diaphragms made of glycocalyx.

Question 13

Discontinuous capillaries?

Answer 13

Large and irregular. Marrow, liver

Question 14

Venules makeup?

Answer 14

Only endothelial, larger than capillaries

Question 15

Small veins makeup?

Answer 15

Thicker adventitia than media. Likely to have collapsed lumen

Question 16

Large veins makeup?

Answer 16

Thick adventitia, vasa vasorum present

Question 17

Layers of heart wall?

Answer 17

Endocardium, subendocardium with purkinje fibers, myocardium, epicardium with blood and nerves

Question 18

Sinoatrial node function?

Answer 18

Generates electrical signals. Atypical intercalated discs

Question 19

AV bide function?

Answer 19

Receives impulses from SA node, transmits to AV bundle of His

Question 20

Are lymphatic capillaries highly permeable?

Answer 20

Yes