KA5 Structure & Function of Artries, capillarys, Veins Flashcards

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1
Q

What is the function of an artery

A

Carry blood away from heart at high pressure

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2
Q

what is the wall structure of an artery

A
  • thick outer layer containing elastic fibres
  • middle layer of smooth muscle & elastic fibres
  • lining of endothelium
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3
Q

what size is the lumen in an artery

A

Narrow

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4
Q

What is function of the thick and elastic wall in the artery

A

withstands surge of blood when heart contracts

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5
Q

What is the function of Smooth muscle in artery walls

A

Controls blood flow by contracting and relaxing causing vasoconstriction, vasodilation

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6
Q

What is the function of a capillary

A

Allows exchange of substances

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7
Q

what is the wall structure of a capillary

A

very thin, one cell thick

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8
Q

what size is the lumen in a capillary

A

very narrow

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9
Q

what is the function of a vein

A

carries blood towards the heart

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10
Q

what is the wall structure of a vein

A
  • thin outer layer containing elastic fibres
    *middle layer containing muscle and elastic fibres
  • lining of endothelium
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11
Q

What size is the lumen in a vein

A

wide

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12
Q

what is the function of a wide lumen in a vein

A

less resistance to blood flow

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13
Q

What does blood consist of

A

red blood cells, white blood cells, platelets and plasma

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14
Q

what is plasma

A

watery yellow fluid that contains all blood cells and glucose, amino acids, carbon dioxide, plasma proteins & ions

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15
Q

why is blood forced into capillaries

A

blood arriving at ateriole side of capillary bed at a higher pressure thus it undergoes pressure filtration

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16
Q

what does pressure filtration do

A

causes much of plasma to pass through thin capillary walls into tissue fluid surrounding the cell

17
Q

why cant plasma proteins be filtered through capillary walls

A

too large

18
Q

what does tissue fluid supply cells with

A

Glucose and Oxygen

19
Q

what does into tissue fluid from cells

A

Cardon dioxide and Urea

20
Q

where does tissue fluid go

A

back into blood through capillaries at venule side of capillary bed

21
Q

where does excess fluid go

A

absorbed by thin-walled lymphatic vessels, fluid is now called lymph and returns lymph to circulatory system (bs)