Multiple Choice
Which of the following is not a function of calcium in the human body?
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2. Cell Chemistry & Cell Components
Introduction to Chemical Bonding
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Which of the following substances acts as a surfactant in the lungs?
A
Carbonic anhydrase
B
Hemoglobin
C
Pulmonary surfactant
D
Mucus
Verified step by step guidance1
Understand the role of surfactants in the lungs: Surfactants reduce surface tension in the alveoli, preventing collapse and aiding in efficient gas exchange.
Identify the substances listed: Carbonic anhydrase is an enzyme that helps convert carbon dioxide and water into carbonic acid. Hemoglobin is a protein in red blood cells that carries oxygen. Mucus is a secretion that traps particles and pathogens.
Recognize that pulmonary surfactant is a complex mixture of lipids and proteins secreted by type II alveolar cells in the lungs.
Recall that the primary function of pulmonary surfactant is to lower the surface tension at the air-liquid interface within the alveoli.
Conclude that among the options provided, pulmonary surfactant is the substance that acts as a surfactant in the lungs.
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