The Surface Area of the Intestines Is Increased in Humans

question 12

Multiple Choice

The surface area of the intestines is increased in humans by the _______, in sharks by the _______, and in earthworms by the _______.

• A) villi and microvilli; spiral valve; typhlosole
• B) villi and microvilli; typhlosole; spiral valve
• C) villi and microvilli; length of the intestine; spiral valve
• D) villi and lacteals; spiral valve; typhlosole
• E) caecum; length of the intestine; villi and microvilli

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Definitions:

Profit-Maximizing Output

The level of production at which a business achieves the highest possible profit, balancing costs against revenues.

Cost Function

A mathematical relation that describes how production costs vary with changes in the quantity of output produced.

Profit-Maximizing Output

The quantity of production that generates the highest possible profit for a firm, determined by the intersection of marginal cost and marginal revenue.

Price Equals Marginal Cost

This principle suggests that in a competitive market, firms set prices equal to their marginal cost of production, achieving economic efficiency.