Exploring the Human Respiratory System

Which structure is the main site of gas exchange in the human respiratory system?

• Trachea

• Alveoli

• Bronchi

• Larynx

What is the primary function of the diaphragm during inhalation?

• Contracts and moves upwards, decreasing thoracic volume

• Relaxes and moves downwards, increasing thoracic volume

• Contracts and moves downwards, increasing thoracic volume

• Relaxes and moves upwards, increasing thoracic volume

Which of the following best describes the process of external respiration?

• Exchange of gases between blood and body tissues

• Exchange of gases between alveoli and blood

• Production of energy in cells

• Movement of air into and out of the lungs

In a labelled diagram of the respiratory system, which structure connects the pharynx to the trachea?

• Larynx

• Bronchi

• Alveoli

• Diaphragm

Which gas diffuses from the alveoli into the blood during gas exchange?

• Carbon dioxide

• Nitrogen

• Oxygen

• Argon

What is the correct order of airflow from the nose to the alveoli?

• Nose → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Alveoli

• Nose → Larynx → Pharynx → Trachea → Bronchi → Bronchioles → Alveoli

• Nose → Trachea → Pharynx → Larynx → Bronchi → Bronchioles → Alveoli

• Nose → Bronchi → Trachea → Larynx → Pharynx → Bronchioles → Alveoli

Which of the following best explains why the alveoli are well suited for gas exchange?

• They have thick walls and a small surface area

• They have thin walls and a large surface area

• They are filled with mucus

• They are lined with cartilage

On a labelled diagram of the respiratory system, what is the name of the tube that branches into the left and right lungs?

• Trachea

• Bronchi

• Bronchioles

• Alveoli

Which equation best represents the exchange of gases in the alveoli?

Which structure prevents food from entering the trachea during swallowing?

• Epiglottis

• Larynx

• Pharynx

• Diaphragm