breathing

Question 1

Describe the process of
inhalation

Answer 1

Diaphragm is pulled down

Ribs move up and out.

Increased volume

Decreased pressure

Air moves in via the trachea

Question 2

Describe the process of
exhalation

Answer 2

Diaphragm relaxes up

Ribs move down and in

Decreased volume

Increased pressure

Air moves out via the trachea

Question 3

Describe how the alveoli are
adapted for gas exchange

Answer 3

Large surface area

Thin- short diffusion distance

Good blood supply to maintain
concentration gradient

Ventilated to maintain
concentration gradient.