Week 6: Histology of CV system

Question 1

What comprises tunica Intima?

Answer 1

Endothelium, basal lamina, connective tissue

Question 2

What comprises tunica media?

Answer 2

Smooth muslce, elastic fibres

Question 3

Which component of vessesl are nerve?

Answer 3

T. Adventitia

Question 4

What vessel has internal elastic membrane?

Answer 4

Muscular artery

Question 5

Layers of arteriole

Answer 5

Endothelium, 1-2 layers SM, thin T. adventitia

Question 6

Types of Capillaries

Answer 6

Continuous, Fenestrated, Discontinuous

Question 7

Continuous capillary

Answer 7

-skin, CNS. Zonula occludens hold endothelial cells together, pinocytic vesicles in cytoplasm, LArger molecules - selective transportedd, diffusion of gases & small molecules

Question 8

Fenestrated capillary

Answer 8

• glands, GIT. 80nm holes in PM. +/- diaphragm

Question 9

Discontinuous capillary

Answer 9

= sinusoid. e.g. in liver, bone marrow & spleen. Gaps between endothelial cells + pores within plasma membrane. partial/no basal lamina. Permeable to large molecules, erythrocytes & leukocytes

Question 10

How do veins differ from arteries?

Answer 10

1. Thinner walls. 2. larger lumen 4. irregular in shape 4. t. adventitia thickest layer. 5. may see valves

Question 11

Walls of heart?

Answer 11

Epicardium, nyocardium, endocardium

Question 12

Endocardium features

Answer 12

Endothelium + loose CT. + Purkinje fibres

Question 13

Features of purkinje fibres

Answer 13

Modified cardiac muscle cells with nuronal function. Very large cells, round nuclei, pale staining. Located in endocardium

Question 14

Myocardium features

Answer 14

Cardiac muscle. Thinner in atrium wall compared to ventricle. Single nuclesu, centrally located. Branched, intercalated discs.

Question 15

Epicardum

Answer 15

Vsiceral layer of serious pericardium, simple squamous epithelium (mesothelium) +CT +Adipose