Which of the following is not part of the ventilatory system?

• bronchioles

• trachea

• oesophagus

• bronchus

• pharynx

Which of the following is the main organ of gas exchange?

• lungs

• diaphragm

• bronchi

• larynx

What is the name of the small sacs specially adapted for gas exchange?

• bronchioles

• alveoli

• trachea

• villi

By which process does O² enter and CO₂ leave the blood?

• active transport

• dispersion

• diffusion

• osmosis

Which of the following structures is lined with C-shaped cartilage to prevent collapse?

• bronchioles

• alveoli

• lungs

• trachea

During inhalation...

• the diaphragm contracts and flattens

• the diaphragm relaxes and becomes dome-shaped

• the external intercostal muscles contract

• the external intercostal muscles relax

During inhalation...

• Volume of the thorax decreases

• Pressure in the thorax decreases

• Volume of the thorax increases

• Pressure in the thorax increases

Vital capacity:

• total volume of air that can be voluntarily moved in one breath

• volume of air inhaled or exhaled in a single breath at rest

• volume of air in the lungs following a maximal expiration

• volume of gas that can be expired at the end of a tidal expiration

Tidal volume:

• total volume of air that can be voluntarily moved in one breath

• volume of air inhaled or exhaled in a single breath at rest

• volume of air in the lungs following a maximal expiration

• volume of gas that can be expired at the end of a tidal expiration

Residual volume:

• total volume of air that can be voluntarily moved in one breath

• volume of air inhaled or exhaled in a single breath at rest

• volume of air in the lungs following a maximal expiration

• volume of gas that can be expired at the end of a tidal expiration