Respiratory System 1- Circle the correct letter.

1-Oxygen from the air enters the blood at the level of
a-trachea
b-bronchioles
C-alveoli

2-When you breathe, your lungs take in and remove
a-air / oxygen
b-oxygen/carbon dioxide
c-carbon dioxide/waste

3-Which of the following are features of alveoli that adapt them to gas exchange?

a-high surface area
b-thin walls
c-dry surfaces
d-both a and b

4-What is the correct order through which air passes during inhalation?

a-trachea--- bronchi bronchioles --- alveoli
b-bronchioles bronchi trachea alveoli
C-trachea bronchioles bronchi alveoli

5-Thin-walled blood vessels that allow the exchange of gases between blood and alveoli are the
a-arteries
b-veins
C. capillaries

6-What part of blood is responsible for carrying respiratory gases?

a-plasma
b-red blood cells
C-white blood cellsRespiratory System