Chapter 15: Cardiovascular System Flashcards

1
Q

blood vessels

A

organs of the cardiovascular system; forms closed circuits and transport blood from heart, to body cells, and back to heart

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2
Q

types of blood vessels (5)

A
  • arteries
  • arterioles
  • capillaries
  • venules
  • veins
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3
Q

arteries

A

carry blood away from ventricles of the heart

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4
Q

arterioles

A

receive blood from arteries & carry it to capillaries

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5
Q

capillaries

A

1 cell layer thick; endothelial, sites of exchange between body cells & blood

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6
Q

venules

A

receive blood from the capillaries & conduct it to veins

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7
Q

veins

A

receive blood from venules & carry it back to atria of heart

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8
Q

3 layers of arteries

A
  • interna
  • media
  • externa
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9
Q

interna

A

innermost layer of arteries

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10
Q

media

A

smooth muscle & elastic tissue; thicker in arteries than in veins

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11
Q

externa

A

outer layer, connective tissue of arteries

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12
Q

what do arteries do?

A

transport blood under high pressure; give rise to arterioles

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13
Q

what can both arteries & arterioles undergo?

A

vasocontstriction & vasodilation

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14
Q

what do capillaries do?

A
  • connect smallest arterioles & smallest venules
  • blood flow regulated by precapillary sphincters
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15
Q

precapillary sphincters

A

smooth muscles surrounding capillary when it branches off arteriole or met arteriole

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16
Q

what type of endothelium do capillaries have?

A

simple squamous

17
Q

vasoconstriction

A

decrease diameter

18
Q

vasodilation

A

increase diameter

19
Q

capillary exchange

A

exchange gas, nutrients, & metabolic by products between blood and tissue around cells

20
Q

methods of capillary exchange

A
  • diffusion
  • osmosis
  • filtration
21
Q

diffusion

A
  • most important
  • lipid soluble substances diffuse through membrane
  • water soluble substances diffuse through slits
22
Q

filtration

A
  • hydrostatic pressure forces molecules through membrane
  • pressure derived from ventricular contraction
23
Q

osmosis

A
  • presence of impermeant solute inside capillaries creates osmotic pressure
  • osmotic pressure draws water into capillaries, opposing filtration
24
Q

venule function

A
  • microscopic blood vessels that transport blood from capillaries to veins
  • thinner walls & less smooth muscle than arteries
25
Q

arterial end

A

moves blood out

26
Q

vein function

A
  • function as blood reservoirs
  • carry blood under low pressure
  • thin walls
  • flap like valves
27
Q

how much blood is in veins & venules?

A

2/3

28
Q

blood pressure

A

force the blood exerts against inner walls of blood vessels; blood moves higher to lower pressure

29
Q

systolic

A

max pressure reached during ventricular contraction

30
Q

diastolic

A

min pressure remaining before next ventricular contraction

31
Q

pulse pressure

A

difference between systolic & diastolic pressure

32
Q

mean arterial

A

average pressure in arterial system; average force driving blood to tissue

33
Q

how is blood pressure measured?

A

SP/DP; mmHg

34
Q

normal BP

A

120/80