Gas Exchnage

Question 1

Is the blood in the capillaries surrounding the alveoli oxygenated or deoxygenated?

Answer 1

It is deoxygenated

Question 2

Why is the blood in the capillaries the way it is?

Answer 2

Oxygen has been used up at the tissues for respiration and carries waste products such as carbon dioxide

Question 3

What is within an alveoli?

Answer 3

Air that is oxygen-rich at sea level, containing small amounts of carbon dioxide

Question 4

What is partial pressure?

Answer 4

The pressure exerted by an individual gas in a mixture of gases

Question 5

What is diffusion?

Answer 5

The movement of gases from an area of high partial pressure to an area of low partial pressure until equilibrium is reached

Question 6

What is a diffusion gradient?

Answer 6

The difference in areas of pressure from one side of the membrane to the other

Question 7

What is the internal site for gas exchange?

Answer 7

Blood capillary to muscle cell membrane

Question 8

What is the external site for gas exchange?

Answer 8

Alveoli to blood capillary membrane

Question 9

What does a steep gradient mean?

Answer 9

There is a large rate of gas exchange

Question 10

What are the values of oxygen and carbon dioxide in the alveoli at rest? (External site)

Answer 10

105 mmHg = Oxygen

40 mmHg = Carbon dioxide

Question 11

What are the values of oxygen and carbon dioxide in the muscles at rest? (External site)

Answer 11

40 mmHg = Oxygen

46 mmHg = Carbon dioxide