Gases & Gas Diffusion in Different Environments

Question 1

How do animals obtain energy?

Answer 1

Oxidation of food

Question 2

How do we obtain oxygen?

Answer 2

Through diffusion

Question 3

What does the diffusion of gases depend on?

Answer 3

Partial pressure difference of gas between 2 regions

Question 4

What is the function of lung surfactant?

Answer 4

Lubricates lungs
Stops the lungs collapsing

Question 5

What is the partial pressure of oxygen?

Answer 5

160mmhg

Question 6

What is the abbreviation for partial pressure?

Answer 6

PO2

Question 7

What is Dalton’s law of partial pressures?

Answer 7

The total pressure exerted by a mixture of gases = to sum of individual pressures

Question 8

How do you calculate partial pressure?

Answer 8

% Gas of 760 mmhg
E.g. O2

0.21x 760 = 160mmhg

Question 9

As the altitude decreases, does partial pressure of oxygen increase or decrease?

Answer 9

Decreases

Question 10

Why does oxygen diffuse slower at higher altitudes?

Answer 10

Lower partial pressure difference

Question 11

What is the concentration of gases in solution at equilibrium (gas tension) measured in?

Answer 11

Ml gas/litre solution

Question 12

Is oxygen soluble in water?

Answer 12

No, so not as readily available