The Respiratory System

What is the primary function of the respiratory system?

• To circulate blood throughout the body.

• To break down food for energy.

• To supply the body with oxygen and remove carbon dioxide.

• To produce hormones for growth.

What is the main purpose of oxygen in our cells?

• To help digest food.

• To perform cellular respiration and generate energy.

• To build new tissues.

• To regulate body temperature.

Which zone of the respiratory system is responsible for gas exchange within the lungs?

• The Conducting Zone

• The Respiratory Zone

• The Nasal Zone

• The Pharyngeal Zone

What is the primary function of the nasal conchae in the nasal cavity?

• To produce mucus.

• To separate the nasal cavity from the oral cavity.

• To filter, heat, and moisten the air.

• To detect smells.

What is the function of the epiglottis during swallowing?

• To produce sound.

• To filter incoming air.

• To cover the laryngeal inlet to prevent food from entering the airway.

• To connect the pharynx to the trachea.

What are the smallest airways in the lungs, less than a millimeter in diameter, called?

• Trachea

• Bronchi

• Bronchioles

• Alveoli

Where does gas exchange primarily take place in the lungs?

• In the trachea.

• In the bronchioles.

• In the alveoli.

• In the pulmonary arteries.

How many fissures and lobes are typically found in the right lung, compared to the left lung?

• Right: 1 fissure, 2 lobes; Left: 2 fissures, 3 lobes.

• Right: 2 fissures, 3 lobes; Left: 1 fissure, 2 lobes.

• Right: 2 fissures, 2 lobes; Left: 1 fissure, 3 lobes.

• Both have 1 fissure and 2 lobes.

What happens during inspiration (breathing in)?

• The diaphragm relaxes and intercostal muscles relax.

• The thoracic cavity reduces in volume.

• The diaphragm contracts and intercostal muscles contract, expanding the thoracic cavity.

• Air is forced out of the lungs due to increased pressure.