Human Phys 6.5 Flashcards

1
Q

What is pressure a result of?

A

Multiple impacts of moving molecules against a surface

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2
Q

What is pressure directly proportional to?

A

Concentration of the gas molecules

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3
Q

What is the partial pressure of gas equal to?

A

The fraction of that gas in the gas mixture multiplied by atmospheric pressure

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4
Q

What must the sum of all individual gas fractions equal?

A

One

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5
Q

What must the sum of partial pressures equal?

A

The total pressure

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6
Q

What happens when gas is dissolved in a fluid?

A

Solubility of the gas in the fluid contributes to the partial pressure and concentration of that gas

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7
Q

What happens when molecules are strongly attracted to each other?

A

They can not move as freely

Less impact against the surface

Less pressure generated

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8
Q

What happens to the partial pressure when molecules are strongly attracted to eachother?

A

Low partial pressure with more dissolved molecules

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9
Q

What happens to the partial pressure when molecules are repelled from eachother?

A

High partial pressure with less dissolved molecules

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10
Q

Henry’s law

A

Partial pressure= concentration of dissolved gas/ solubility coefficient

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11
Q

What is the solubility of CO2 compared to O2?

A

20x more

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12
Q

What is the main limitation of diffusion for gases?

A

Water not membranes (they are lipid soluble so they can move through membranes)

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13
Q

What are factors that affect rate of diffusion?

A

Diffusion coefficient of each gas

Surface area of the membrane

Partial pressure difference

Thickness of membrane

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14
Q

What is diffusing capacity of the respiratory membrane?

A

Volume of gas that will diffuse through the membrane each minute for a partial pressure difference of 1 mmHg

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15
Q

What is the diffusing capacity of O2?

A

21 (can increase to 65 during exercise)

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16
Q

What is the diffusing capacity of CO2?

A

20x more than O2