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DPT MAP II Midterm > CV System: The Physiology Of Circulation > Flashcards

CV System: The Physiology Of Circulation Flashcards

1
Q

Arterial pressure is generally controlled independently of

A

Local tissue flow or CO

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2
Q

Circulation is influenced by

A

Blood flow, pressure,resistance, control mechanisms mediating these characteristics

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3
Q

Transport blood under high pressure, strong vascular walls, rapid blood flow

A

Arteries

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4
Q

Final small branches of arterial system, act as control conduits-blood released into capillaries, strong muscular walls that vasoconstriction/dilate, innervated by SNS only

A

Arterioles

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5
Q

Percent of total blood volume in veins

A

64

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6
Q

Do veins have thick or thin walls

A

Thin, low pressure

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7
Q

Distribution of blood volume systemically

A

Veins-64%
Arteries-15%
Capillaries-5%

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8
Q

Heart holds __ % of total blood volume

A

7

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9
Q

Pulmonary system holds __% of blood volume

A

9

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10
Q

Blood flow affected by 2 factors

A

Pressure gradient, vascular resistance

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11
Q

Ohm’s law

A

F = change in pressure between 2 ends of vessel/ resistance

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12
Q

Two descriptions of flow

A

Laminar, turbulent

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13
Q

What is the reciprocal of resistance

A

Conductance

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14
Q

Measure of blood flow through a vessel for a given pressure difference

A

Conductance

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15
Q

Small change in ____ causes enormous change in conductance

A

Diameter - conductance of vessel increases in proportion to the 4th power of diameter

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16
Q

Poiseuille’s law states that _____ plays the greatest role in determining rate of LAMINAR flow

A

Diameter

17
Q

____ of systemic resistance to flow is

A

2/3, arteriole resistance

18
Q

Strong muscular walls of arteriole can change diameter up to ___fold. Which in turn increases blood flow up to ___fold

A

4,256

19
Q

Viscosity has an ________ relationship to blood flow

A

Inverse

20
Q

Pressure that propels blood to tissues

A

MAP

21
Q

Affected by Stroke volume and compliance of arterial tree

A

Pulse pressure

22
Q

MAP and plus pressure ____ with increasing distance from heart

A

Decreases

23
Q

Is distensibility higher in veins or arteries

A

Veins

24
Q

Total quantity of blood that can be stored in a given portion of the circulation for each mmHg pressure rise

A

Compliance or capacitance

25
Q

Compliance=

A

Distensibility x volume

26
Q

Reduces the resistance to BF in upstream arteries

A

Endothelium-derived relaxing factor (EDRF) made primarily of nitric oxide (NO)

27
Q

Vadoconstrictors

A

Nor/epinephrine
Angiotensin II
Vasopressin
Endothelin

28
Q

Vasodilators

A

Bradykinin

Histamine

29
Q

Co is a response to

A

Vascular inflow

DPT MAP II Midterm (7 decks)

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