Topic 43 - Capillaries

Question 1

Capillaries:

General facts:

Answer 1

• Are ”exchange vessels”.
• Form network of small diameter thin-walled blood vessels.
• Density depends on organ, or tissue.

Question 2

Endothelial layer

Answer 2

density depends on organ or tissue, single cell diameter is possible, function as exchange vessels.

Question 3

Caveoles:

Answer 3

connect capillary lumen to surrounding tissue.

Question 4

Pericytes

Answer 4

attach to outer wall of capillary.

Question 5

Types of capillaries

Answer 5

Continuous
Fenestrated
Sinuses

Question 6

Continous

Answer 6

-endothelium is completely closed. Lamina basalis is continuous. Found in skeletal muscle, lung, connective tissue brain, retina, ect.

Question 7

Fenestrated

Answer 7

-flattened endothelial cells with pores. Found in intestines, kidney, endocrine organs.

Question 8

Sinuses

Answer 8

large diameter and thin walled. Endothelium is continuous or fenestrated (heptatic sinusoids). Spleen cells enter blood due to sinuses between endothelial cells