What is the function of pulmonary surfactant?
A. Pulmonary surfactant is the precursor to mucus and aids in the removal of debris from the lungs.
B. Pulmonary surfactant is secreted to reduce the coefficient of diffusion for the respiratory membrane.
C. Pulmonary surfactant reduces surface tension of the lungs.
D. Pulmonary surfactant is a term used to describe the large surface area of blood found within the lungs.
Answer: C. Pulmonary surfactant reduces surface tension of the lungs.
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What type of photoreceptor cell perceives color?
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