Applied Anatomy and Physiology - Gas Exchange

Question 1

What is gas exchange?

Answer 1

The exchange of oxygen and carbon dioxide by the process of diffusion

Question 2

What is diffusion?

Answer 2

The movement of gas from an area of high pressure to an area of low pressure

Question 3

What is the difference between an area of high pressure and area of low pressure called?

Answer 3

Diffusion gradient

Question 4

What is partial pressure?

Answer 4

The pressure of one gas within a mixture of gases

Question 5

What is the partial pressure of oxygen?

Answer 5

pO2

Question 6

What is the partial pressure of carbon dioxide?

Answer 6

pCO2

Question 7

What is the external site for gas exchange?

Answer 7

In the lungs between the blood capillaries and the alveoli

Question 8

What is the internal site for gas exchange?

Answer 8

In the muscle cell between the capillaries and muscle cell

Question 9

How does oxygen move down the diffusion gradient during external inspiration?

Answer 9

pO2 105 - alveoli
pO2 40 - capillary blood
=65mmHg

Question 10

Where is the oxygenated blood and deoxygenated blood in the external site?

Answer 10

deoxygentaged blood arrives in the blood capillaries and there is oxygen-rich atmospheric air in the alveoli

Question 11

Where is the oxygenated blood and deoxygenated blood in the internal site?

Answer 11

oxygenated blood arrives in the capillaries and the muscle cells produce carbon dioxide

Question 12

How does carbon dioxide move down the diffusion gradient during external inspiration?

Answer 12

pCO2 46 - capillary

pCO2 40 - alveoli

Question 13

How does oxygen move down the diffusion gradient in the internal site?

Answer 13

pO2 100 - capillary

pO2 40 - muscle cell