Science module 1

1.Which of the following is the primary function of the circulatory system?

•    a) Digestion of food

• b) Exchange of gases in the lungs

• c) Transport of oxygen and nutrients

• d) Filtration of waste products

2.Oxygenated blood is carried away from the heart by:

•    a) Veins

• b) Capillaries

• c) Arteries

• d) Alveoli

3.Gas exchange occurs in the lungs at the:

• a) Bronchi

• b) Trachea

• c) Alveoli

• d) Diaphragm

4. Which blood component carries oxygen throughout the body?

• a) White blood cells

• b) Platelets

• c) Red blood cells

• d) Plasma

 5.Capillaries are essential for:

• a) Pumping blood

• b) Carrying blood away from the heart

• c) Exchange of gases and nutrients between blood and tissues

• d) Returning blood to the heart

6. The tiny air sacs in the lungs where gas exchange occurs are called _____________.

7.Blood returns to the heart from the body through _____________.

8. The heart's job is to ________ blood.

9.During exhalation, the diaphragm _______________.

10.Blood carries _________ to all parts of the body.