Circulatory Tissues

Question 1

Answer 1

Arterioles

BM basement membrane E endothelial cells M tunica media SM smooth muscle cells

Small muscular arteries -> large arterioles involves loss of internal elastic lamina.

Question 2

Answer 2

Basic layers of circulatory tissue

Question 3

Answer 3

Capillary

E endothelial cell nuclei (flattened) P pericytes (flattened cells)

Question 4

Answer 4

Continuous capillary

BM basement membrane BMp basement membrane (pericyte) C collagen fibrils EC endothelial cell cytoplasm M marginal folds P pericyte

Marginal folds small cytoplasmic flaps that extend across the intracellular junctions are luminal surface.

Question 5

Answer 5

Diapedesis

E endothelial cells MF marginal fold Ps pseudopodium

Question 6

Answer 6

Elastic Artery (aorta)

I tunica intima M tunica media A tunica adventitia V vasa vsorum

Vasa vasorum is present in the tunica adventitia and responsible for feeding the muscles.

Question 7

Answer 7

Fenestrated capillary 1

BM basement membrane D electron-dense line EC endothelial cytoplasm

Question 8

Answer 8

Fenestrated capillary 2

EC endothelial cell cytoplasm F fenestrations

Fenestrations are pores through attenuated areas of the endothelial cytoplasm.

Question 9

Answer 9

Heart - left ventricle

E endocardium M myocardium P visceral pericardium (epicardium)

Question 10

Answer 10

Heart

BB conducting bundle branch En endocardium M myocardial fibres P purkinje fibres

Question 11

Answer 11

Large muscular vein

A tunica adventitia M tunica media V vasa vasorum

Question 12

Answer 12

Lymphatic vessel

V vales

The structure of these valves is similar to that of valves in the venous system, but the supporting tissue core consists merely of reticulin fibres and a little ground substance.

Question 13

Answer 13

Muscular artery

A tunica adventitia EEL external elastic lamina M tunica media IEL internal elastic lamina

Question 14

Answer 14

Small muscular artery

A tunica adventitia E intimal endothelial cells IEL internal elastic lamina M tunica media

Question 15

Answer 15

Vein

A tunica adventitia M tunica media

Question 16

Answer 16

Venules 1

V1 small muscular venule V2 large muscular venule V3 small vein

Question 17

Answer 17

Postcapillary, collecting and muscular venules

A small arteriole C capillaries CV collecting venules MV muscular venules PCV postcapillary venules

Postcapillary venules drain into collecting venules which are structurally similar but larger, with more surrounding pericytes.