White blood cells help fight infection by destroying the invaders in our body, such as pathogens, bacteria, and viruses.

C. III only

The respiratory system depend on the circulatory system for the the transport of oxygen throughout the body. The uptake of oxygen in the organs depends on the red blood cells, which carry the oxygen within the bloodstream.

D. Blood cells pick up and carry oxygen from the lungs to the body’s cells.

Gas exchange takes place in the small air spaces called alveoli.

C. alveoli

Plasma, phagocytes, hemoglobin, and platelets are all the components found in a blood, whereas mucus is found in the respiratory system.

B. mucus

Nicotine is a kind of stimulant drug that makes the heart rate and blood pressure increase. It paralyzes the cilia and reduces the airflow in the alveoli.

E. paralyzes cilia

Lymphocytes is a type of white blood cell that produces antibodies to fight the viruses, bacteria, and other harmful microorganisms that cause diseases in the body.

C. lymphocytes

The respiratory passageways, such as the nose, contain cilia and mucus that ensures the air is warmed, filtered, and moistened. In the diagram, the nose is represented by the number 1.

A. 1

Larynx, which is known as the voice box, houses the vocal cords. It is represented by the number 4.

D. 4

Emphysema is a lung disease that is characterized by the impairment of the air sacs in the lung tissues. The air sacs or alveoli in the lungs are represented by the number 5.

E. 5

The air sacs or alveoli in the lungs are represented by the number 5.

E. 5