Chapter 20 Slides 38+ Flashcards

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1
Q

________ _______ picks up excess fluid not reabsorbed at the capillary, filters fluid and returns it to venous circulation

A

lymphatic system

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2
Q

local blood flow is dependent upon what four variables?

A

1) degree of tissue vascularity
2) myogenic response
3) local regulatory factors altering blood flow
4) total blood flow

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3
Q

extent of vessels in tissue

A

vascularity degree of vascular ization

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4
Q

metabolically active tissues have high_________

A

vascularity

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5
Q

areas that have a high degree of vascularization

A

brain, skeletal muscle, heart, liver,

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6
Q

structures that have little vascularity or are avascular?

A

tendons, ligaments, epithelia, cartilage, cornea, lens of eye

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7
Q

_______ _______: smooth muscle in blood vessel wall keeps local flow relatively constant

A

myogenic response

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8
Q

if systemic blood pressure Rises the arterial will stretch, due to myogenic response smooth muscle of arterial wall or respond by?

A

contracting

contractional return local flow to original levels

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9
Q

if systemic blood pressure decreases and the amount of blood decreases there will be less stretch, in response to decreased stretch due to myogenic response smooth muscle will?

A

relaxes, relaxation will return local blood flow to original levels

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10
Q

vasoactive chemicals alter?

A

blood flow

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11
Q

___________ dilate arterioles and relax precapillary sphincters, increase flow into capillary beds.

A

vasodilators

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12
Q

_________ constrict arterioles and cause contraction of precapillary sphincters decreasing flow into capillary beds

A

vasoconstrictors

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13
Q

___________ and changing metabolic activity: process by which tissue controls local blood flow. when tissue activity increases, stimuli signal inadequate perfusion

A

autoregulation

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14
Q

oxygen and nutrient decline, and carbon dioxide, lactic acid, hydrogen and potassium increase will stimulate ____________ through autoregulation

A

vasodilators

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15
Q

in autoregulation as perfusion increases vessels ___________ in response

A

constrict, negative feedback

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16
Q

autoregulation in changing metabolic activity.___________ increase in blood flow after it is temporarily disrupted.functioning to restore required oxygen nutrients and eliminate waste

A

reactive hyperemia

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17
Q

in autoregulation the term reactive hyperemia refers to an increase in blood flow after?

A

blood flow is temporarily disrupted

additional blood is required to resupply oxygen nutrients and eliminate wastes

18
Q

the increase in blood flow after entering a warm room filing being cold is an example of?

A

reactive hyperemia

19
Q

during _________ damaged tissue, leukocytes and platelets release and vasoactive chemicals

A

inflammation

20
Q

what are three vasodilators associated with inflammation?

A

histamine, Bradykinin, nitric oxide

21
Q

what are two vasoconstrictor associated with tissue damage

A

prostaglandins and thromboxanes

22
Q

prostaglandins and thromboxanes help prevent?

A

blood loss through vasoconstriction.

local regulatory factors

23
Q

chemicals that are released in response to trauma allergy infection and exercise?

A

histamine
Bradykinin
nitric oxide

24
Q

what is total blood flow?

A

amount of blood transported through all blood vessels per unit time

about 5.25 L/ min equal to cardiac output

25
Q

regulation of total blood flow depends on both?

A

heart and vessels

blood pressure and resistance

26
Q

change in blood pressure from one end of vessel to other?

A

blood pressure gradient

27
Q

blood pressure is highest in__________ and lowest in ______

A

arteries

lowest in veins

28
Q

__________ pressure occurs when ventricle contracts. recorded as top number of BP ratio

A

systolic

29
Q

__________ pressure occurs when ventricle relaxes. recorded as the lower number of blood pressure ratio.

A

diastolic pressure

30
Q

__________ _____: pressure in arteries added by heart contraction

A

pulse pressure

31
Q

how do you calculate pulse pressure?

A

the difference between systolic and diastolic pressure

32
Q

_________ pressure reflects the elasticity and recoiled of arteries

A

pulse pressure

33
Q

_________ pressure allows for palpation of thriving pulse in elastic arteries

A

pulse pressure

34
Q

if BP is 120/80 what is the pulse pressure?

A

40

35
Q

a place where am arteries may be compressed against a solid structure to measure heart beat

A

pulse point

common carotid, radial, femoral, dorsalis pedis, and others

36
Q

what is mean arterial pressure?

A

average arterial pressure access entire cardiac cycle

37
Q

diastolic pressure + 1/3 pulse pressure =

A

MAP mean arterial pressure

38
Q

MAP under 60 may indicate?

A

insufficient blood flow

39
Q

pressure no longer fluctuates between systolic and diastolic when it reaches the?

A

capillaries

40
Q

________ BP is low and not pulsatile

A

venous

41
Q

venous return of blood to the heart depends on what three things?

A

pressure gradient, skeletal muscle pump, respiratory pump

42
Q

blood is returned to the heart more rapidly during exersize and pools.jn leg veins during prolonged inactivity. _______ _______ _____ assists in venous return

A

skeletal muscle pump