Lung Surfactants Function to Decrease the Likelihood of Collapse of the Alveoli

question 48

Multiple Choice

Lung surfactants function to decrease the likelihood of collapse of the alveoli when air is expired.Based on your knowledge of lipids and amphipathic molecules,which of the following explains the mechanism by which the dipalmitoyl phosphatidylcholine (DPPC) can accomplish this task?

• A)The hydrophilic head groups are bulky and expand the surface area of the alveoli.
• B)The inclusion of saturated fatty acids on the glycerophospholipid allows close packing of tail groups which are fully extended and prevent collapse upon expiration.
• C)The hydrophobic portion of the DPPC repel air,forcing the alveoli space open.
• D)The choline portion of the molecule is bulky,thus increasing surface area of alveoli.
• E)None of the above explain the mechanism.

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Definitions:

Liquidation Balances

The final amounts owed to creditors and investors after a company has been liquidated and all assets have been sold off.

Liquidation Process

The procedure of closing a business by selling its assets to pay off its liabilities and distributing any remaining assets to the owners or shareholders.

Gain or Loss

Represents the difference between the sale price of an asset and its original purchase price, indicating a financial profit or deficit.

Income Ratios

Financial metrics that compare different aspects of a company's income, such as net income to sales or net income to total assets, to assess financial health.