Blood Vessels Flashcards

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1
Q

Blood vessels

A

Arteries + veins + capillaries

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2
Q

Basic structure (3 layers)

A

Tunica externa / adventitia (superficial)
Tunica media (middle)
Tunica interna /intima (deep)

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3
Q

Tunica interna

A

endothelium (lining) = simple squamous

basement membrane = loose areolar c.t.

elastic membrane = elastic c.t

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4
Q

Tunica externa

A

Fibrous c.t (collagen + elastic fibres)

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5
Q

Arteries

A

Carry blood away from heart
Oxygenated blood
under high pressure
thick tunica media

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6
Q

Tunica media

A

Smooth muscle + elastic c.t

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7
Q

Elastic arteries

A

Thick layer of elastic tissue
tolerates big pressure changes

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8
Q

Distributing muscular arteries

A

Thick smooth muscle layer
middle size

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9
Q

Arterioles

A

Smallest
shoot muscle layer and endothelium only

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10
Q

Veins

A

Blood toward the heart
carry deoxygenated blood
under low pressure
thin tunica media

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11
Q

Venules

A

Drain blood into veins
No smooth muscle
smallest

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12
Q

Skeletal muscle pump

A

Muscle contraction massages veins (valves prevent back flow)

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13
Q

Respiratory pump

A

Changes in thoracic and abdominal pressure

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14
Q

Capillaries

A

Smallest blood vessels
form capillary beds site of exchange between blood and tissue
endothelium only

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15
Q

Continuous capillaries

A

Main exchange vessels in tissues
exchanges of nutrients, wastes, blood gasses, hormones

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16
Q

Ferestrated capillaries

A

Has pores/fenestrations
for absorption or filtration

17
Q

Sinusoid capillaries

A

Has large gaps
allow passage of large molecules and cells

18
Q

capillary beds

A

Networks of capillaries connecting arterioles with venules regulated by precapillary sprinters