Chapter 5 – Respiratory System

The main function of the respiratory system is:

• Digestion

• Gas exchange (O₂ and CO₂)

• Blood circulation

• Hormone secretion

The process of breathing air in and out is called:

• Inspiration

• Ventilation

• Respiration

• Diffusion

The upper respiratory tract includes all EXCEPT:

• Nose

• Pharynx

• Larynx

• Trachea

The lower respiratory tract begins at the:

• Nose

• Pharynx

• Larynx

• Trachea

The main openings for air entry into the body are the:

• Mouth

• Nostrils (nares)

• Pharynx

• Bronchi

The nasal septum separates:

• The mouth and pharynx

• The two nasal cavities

• The nasal and oral cavities

• The trachea and bronchi

The nasal cavity is lined with:

The main function of the nose is to:

• Absorb oxygen

• Warm, moisten, and filter air

• Produce mucus only

• Aid in hearing

The receptors for the sense of smell are located in the:

• Nasopharynx

• Roof of nasal cavity

• Larynx

• Trachea

The pharynx serves as a passage for:

• Air only

• Food only

• Both air and food

• Blood