Which are the organs of the respiratory system?

• A. Lungs, heart, and blood.

• B. Rib cage, diaphragm, and lungs.

• C. Nose, lungs, heart, and diaphragm

• D. Lungs, throat, and passageways that lead to the lungs

What happens in the diaphragm when we exhale (breath out)?

• A. The diaphragm relaxes and moves upwards.

• B. The diaphragm contracts and moves upwards.

• C. The diaphragm relaxes and moves downwards.

• D. The diaphragm contracts and moves downwards.

What will happen if the epiglottis does not close the entrance of the airways?

• A. The larynx will be blocked with food particles.

• B. The pharynx will have difficulty swallowing.

• C. The food particles will block the opening of the trachea and a person will have difficulty in breathing.

• D. The food particles will block the bronchioles thus making it difficult to breathe in and breathe out.

What important activity takes place in the lungs?

• A. Food is digested.

• B. Liquid waste is filtered from the blood.

• C. The trachea is exchanged for the larynx.

• D. Oxygen is exchanged for carbon dioxide.

Which is taking place in this figure?

• A. Exhalation; the rib cage is expanding.

• B. Exhalation; the diaphragm is relaxing.

• C. Inhalation; the chest cavity is reduced.

• D. Inhalation; the diaphragm is contracting.

Which statement is true about the human circulatory system?

• A. It makes blood cells.

• B. It transports oxygen and nutrients.

• C. It breaks down food and releases nutrients.

• D. It is the first line of defense against bacteria.

Which blood vessel carries blood back to the heart?

• A. Artery

• B. Blood vessel

• C. Capillary

• D. Vein

Which is NOT a function of the circulatory system?

• A. Deliver oxygen and nutrients to cells.

• B. Break down carbohydrates into glucose.

• C. Transport other materials through the body.

• D. Remove carbon dioxide and wastes from cells.

If a rupture occurs in the pulmonary artery, which passageway is affected?

• A. The passageway of blood going to the aorta.

• B. The passageway of blood going to the lungs.

• C. The passageway of blood going to the vena cava.

• D. The passageway of blood going to the right atrium.

Which path in the figure does the blood follow through the heart as it returns from the head and body?

• A. 1→2

• B. 2→1

• C. 3→4

• D. 4→3