Vocabulary Test: Gas Exchange in Humans

What are alveoli?

• Tiny, thin-walled air sacs in the lungs

• Divisions of the trachea

• Muscles found between the ribs

• Specialised cells that secrete mucus

What is the breathing rate?

• The number of breaths taken per minute

• The volume of air in the lungs

• The pressure in the thorax

• The concentration of oxygen in the air

What is the function of cilia?

• Waft substances across the surface of the tissue

• Secrete mucus

• Contract during inhalation

• Exchange respiratory gases

What happens during expiration?

• The diaphragm relaxes and the ribcage is pulled down

• The diaphragm contracts and the ribcage is raised

• Air moves into the lungs

• The thoracic pressure falls

What is the composition of expired air?

• Higher concentration of carbon dioxide

• Higher concentration of oxygen

• Equal concentration of gases

• Lower concentration of water vapour

What is the role of goblet cells?

• Secrete mucus

• Exchange gases

• Contract during breathing

• Support the trachea

What is the function of the diaphragm?

• Separates the thorax and abdomen

• Supports the trachea

• Controls rib movement

• Secretes mucus

What is the primary airway called?

• Trachea

• Bronchi

• Larynx

• Alveoli

What is ventilation?

• Movement of fresh air into the lungs

• Exchange of gases

• Secretion of mucus

• Contraction of the diaphragm

Respiration in the presence of oxygen that releases energy from the breakdown of glucose. What is the process called?