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Flashcards in Blood Vessels Deck (13)
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1

Arterioles have ______ resistance and therefore _______

Peripheral, blood pressure

2

Arterioles, capillaries and veins so are lined with

Simple squamous epithelium

3

Continuous capillary features

1. Adjacent endothelial cells connected by junctional complexes
2. Most common type
3. Impermeable

4

Fernestrated capillary features

1. Small pores (ferestrae) connected by junctional complexes
2. Permeable
3. Found in Bowman's capsule + small intestine villi

5

Basic structural plan of blood vessels

1. Tunica intima (avascular) : inner-endo cells + connective tissue
2. Tunica media : smooth and connective
3. Tunica adventita: connective + outer

6

Tunica media and adventita may be absent from ______

Small vessels

7

Vaso vasorum

Vessels of vessels -> supplies blood to certain media and adventita

8

Structural features of aorta

Intima: collagen + few elastic fibres, thin layer of c.t.
Media: thick s.m. with sheets of elastic fibres
Adventita: thick collagen, vasa vasorum, nerves

9

Structural features of most systemic arteries

Intima: endo.cells, prominent layer of c.t. = inner elastic lamina
Media: thick s.m. limited c.t.
Adventita: thick c.t. EEL, collagen + nerves

10

Structural features of arterioles

Intima: endo.cells, IEL absent from small arterioles
Media: s.m. 3-6 cells
Adventita: merges with C.T. no EEL

11

Structural features of capillaries

Endo cells, no media/adventita

12

Structural features of venules + veins

Intima: endo. cells , no IEL
Media: s.m.
Adventita: absent/indistinct - merges with c.t.

13

Valves are found in ______ and are

Veins > 2mm diameter, 2 leaflets of c.t. covered with endo.