ventilation

Question 1

describe the process of inhalation

Answer 1

the thorax volume increases, so the air pressure drops causing air to be pulled into the lungs until the pressure it is equal to atmospheric.

Question 2

describe the muscle actions during inhalation

Answer 2

intercostal muscles pull the ribcage up and out

the diaphragm contracts

Question 3

describe the process of exhalation

Answer 3

the thorax volume decreases, so the air pressure increases, forcing air out of the lungs until the pressure is equal to atmospheric

Question 4

describe the muscle actions during exhalation

Answer 4

intercostal muscles and diaphragm relax

Question 5

what concentration of oxygen is in inhaled air

Answer 5

high (low carbon)

Question 6

concentration of oxygen in exhaled air

Answer 6

low( high carbon)

Question 7

how is the rate of diffusion increased?

Answer 7

a constantly high oxygen concentration gradient allows diffusion to occur at all times