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HUBS192 > lecture 11 > Flashcards

lecture 11 Flashcards

1
Q

Why is it better to have high pressure?

A

Allows for greater control of flow

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2
Q

What do the pulmonary capillaries beds do?

A

O2 moves into the blood and CO2 leaves, making deoxygenated blood oxygenated

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3
Q

What kind of circuit distribution is the systemic circuit?

A

Parallel

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4
Q

Why is the systemic circuit described as parallel?

A

Continual branching of the arterial network with differing flows

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5
Q

Which tissue has constant blood flow regardless of exercising or resting?

A

Brain

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6
Q

Which tissues decrease in blood flow when exercising begins?

A

Kidney
Abdominal viscera
GI Tract

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7
Q

Which tissues increase in blood flow when exercise increases?

A

Heart
Skin
Skeletal muscle

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8
Q

Which tissue has the biggest increase in blood flow during exercise?

A

skeletal muscle

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9
Q

How is Mean arterial pressure controlled during exercise?

A

Decrease in total peripheral resistance because of increased cardiac output

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10
Q

Decrease in resistance =

A

increase in flow

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11
Q

What controls organ resistance and regional flow?

A

Arterioles

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12
Q

What is the relationship between resistance and radius?

A

R = 1/r4

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13
Q

Increasing the diameter of a vessel is called?

A

Vasodilation

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14
Q

decreasing the diameter of a vessel is called?

A

Vasoconstriction

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15
Q

Vasodilation will cause what in relation to resistance?

A

Decreased resistance

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16
Q

When under heavy exercise arteries carrying blood to kidneys will what?

A

Vasoconstrict

17
Q

A vessel has a diameter of 1 and a flow of 16. The vessel increases its diameter to 2, what is the flow?

A

256 (16 x 16)

18
Q

What type of cells are arterioles?

A

Smooth muscle cells

19
Q

Why do we have good control of blood flow in the systemic circuit?

A

because it is under high pressure

20
Q

Why are veins under less control?

A

because it is at a low pressure and their purpose is for collecting and carrying back to heart

21
Q

Total blood flow in =

A

Total blood flow out

22
Q

Why does skeletal muscle gain over 300% more blood during heavy exercise?

A

Because there is a high demand for oxygen

23
Q

Why does the skin gain more blood flow during exercise?

A

Because it has to get rid of the excess heat energy produced

24
Q

What are capillaries?

A

Small channels that allow transfer of blood

25
Q

What determines what pressure goes through the capillaries?

A

Arterioles

26
Q

What is humeral control of vasoconstriction and vasodilation?

A

Hormones like adrenaline released into the blood

27
Q

What is the rule of 16?

A

increasing or decreasing radius by a factor of two means an increase/decrease of resistance by a factor of 16

HUBS192 (38 decks)

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