test - respiration and excretory

Question 1

24. true/false.when the diaphragm contracts, air pressure in the chest increases.

Answer 1

false; decreases

nb pg.89/90

Question 2

27. true/false. in gas exchange, oxygen passes from the cell into the blood.

Answer 2

false;carbon dioxide.

nb pg.92

Question 3

43.what happens in the alveoli?

Answer 3

gas exchange happens in the alveoli.gas exchange consists of the movement of oxygen from the air into the bloodstream and the movement of carbon dioxide from the bloodstream to the air.
nb pg.92