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HUBS192 2024 > Lecture 11 > Flashcards

Lecture 11 Flashcards

1
Q

What is the pressure versus flow equation?

A

Q = P / R

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2
Q

Why is it important to maintain high arterial blood pressure?

A

To be able to drive blood around the system and to have control of where are at what pressure blood flows

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3
Q

What is the essential relationship between the hearts left and right pump?

A

Equal flow throughout both circuts

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4
Q

What is the design of systemic circulation?

A

Parallel

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5
Q

What is the design of pulmonary circulation?

A

Series

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6
Q

What are the features of the parallel design of circulation?

A

Continual branching of arterial networks and division of blood among the regional circulations

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7
Q

Is the distribution of cardiac output fixed or dynamic?

A

Dynamic, changed upon bodily needs

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8
Q

Why does blood flow increase to some regions and decrease to others during exercise?

A

To maintain metabolic needs in high-energy places

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9
Q

During exercise, where is the flow of blood increased?

A

Muscle, heart, skin

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10
Q

During exercise, where is the flow of blood decreased?

A

GI tract, kidneys

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11
Q

During exercise, where is the flow of blood consistant?

A

Brain

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12
Q

What is MAP?

A

Mean arterial pressure

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13
Q

What is CO?

A

Cardiac output

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14
Q

What is TPR?

A

Total peripheral resistance

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15
Q

How is MAP controlled during exercise?

A

Increased CO and decreased TPR in order to keep MAP constant

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16
Q

What is the relationship between CO and TPR

A

Inversely proportional

17
Q

What is the total change in resistance when the body is undergoing exercise?

A

Increased

18
Q

How is resistance controlled?

A

By the smooth muscle precapillary sphincters which constrict to increase resistance and dilate to decrease resistance

19
Q

If the resistance is increased, where is the blood skipping?

A

The capillary (exchange) beds

20
Q

If the resistance is increased, through what channel is the blood flowing between arterioles and venules?

A

Thoroughfare channel

21
Q

What is the relationship between resistance and radius?

A

Resistance is proportional to 1 / r^4

22
Q

What is the luminal radius?

A

Radius within the lumen of a blood vessel

23
Q

What is the luminal space?

A

The space within the lumen of a blood vessel

24
Q

If the radius is increased by a factor of 2 what happens to the resistance?

A

It is decreased by a factor of 16

25
Q

If the radius if decreased by a factor of 2 what happens to the resistance?

A

It is increased by a factor of 16

26
Q

What is vasodialation?

A

Increase in radius of a arterial vessel therefore leading to a decrease in resistance

27
Q

What is vasoconstriction?

A

Decrease in radius of a arterial vessel therefore leading to an increase in resistance

HUBS192 2024 (38 decks)

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