Deck 2 Mechanics of Breathing

Question 1

1 Do gases move up or down a concentration gradient?

Answer 1

Down

Question 2

2 What is pressure also refferd to as?

Answer 2

Concentration

Question 3

3 When you breathe in, what happens?

Answer 3

The diaphragm contracts and pulls flat, the in external intercostals move the ribs up and out. This creates a bigger space and a lower pressure. Air then moves from a high concentration (the atmosphere) to a low concentration (the lungs)

Question 4

4 When you breathe out what happens?

Answer 4

The diaphragm rises into a dome shape and the in internal intercostals move the ribs down and in. This creates a smaller space and a higher pressure. Air then moves from a high concentration (lungs) to a low concentration (the atmosphere).

Question 5

5 What is gaseous exchange?

Answer 5

Where 1 type of gas being exchanged for another

Question 6

6 Where and how does gaseous exchange occur?

Answer 6

In the lungs, gaseous exchange occurs by diffusion between air in the alveoli and blood in the capillaries surrounding their walls

Question 7

7 What is this describing?

Blood enters the capillaries from the pulmonary artery (the major vessel that pumps deoxygenated blood from the heart to the lungs), here, it has a lower oxygen concentration and a higher carbon dioxide concentration than the air in the alveoli.

Answer 7

Movement of carbon dioxide

Question 8

8 What si this describing?

Oxygen diffuses into the blood via the surface of the alveoli, through the thin walls of the capillary and into the bloodstream now oxygenated; it latches on to haemoglobin

Answer 8

Movement of oxygen

Question 9

9 Carbon dioxide moves from where it is highly concentrated (the blood) to?

Answer 9

where less concentrated (the alveoli) then we breathe it out.

Question 10

10 Oxygen moves from where it is highly concentrated (the alveoli) to

Answer 10

where less concentrated (the blood).