Gas Exchange

Recall the primary function of the respiratory system.

• To ensure each cell receives enough oxygen

• To facilitate the exchange of carbon dioxide and oxygen between the environment and our bodies

• To digest and metabolise foods

• To maintain the body's optimal pH.

State which of these is the waste gas that is expelled from the body during exhalation.

• Sulfur Dioxide

• Oxygen

• Carbon Monoxide

• Carbon Dioxide

Identify what structure is indicated by the blue arrow in the picture.

• Abdomen

• Pharynx

• Oesophagus

• Vocal Cords

• Diaphragm

Identify what structure is indicated by the blue arrow in the picture.

• Abdomen

• Pharynx

• Trachea

• Vocal Cords

• Bronchi

Recall which of the following causes inhalation.

• The diaphragm contracting

• The diaphragm relaxing

• The intercostal muscles contracting

• The thorax getting smaller

Recall two important features of the alveolar wall for gas exchange to occur. Select All correct options.

• It is thick

• It is thin

• It is moist

• It is dry

In inhaled air, recall if there is a higher concentration of carbon dioxide or oxygen.

• Oxygen

• Carbon Dioxide

Recall what structure in fish is adapted for gas exchange.

• Gills

• Fins

• Scales

• Lungs

Recall why gills are pink in colour.

• Due to blood in the capillaries

• Due to oxygen reacting with the blood

• Due to chlorophyll in the cells

• Due to the countercurrent flow

Explain the difference between respiration and breathing.

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