Question

which statement is true? you can click the view image button to see an image of the small intestine. a) villi are cell extensions that increase the surface area of the small intestine b) villi are like tentacles of an octopus that help to move the food towards the large intestine c) these microvilli enlarge the surface area and enable efficient nutrient uptake d) the surface of the small intestine is enlarged on many levels. here we can see the villi

Explanation:

Villi are finger - like projections in the small intestine. They are not cell extensions but are made up of cells. Microvilli are on the surface of villi and together they increase the surface area for efficient nutrient absorption. The surface of the small intestine is enlarged by folds, villi, and microvilli. Option b is incorrect as villi do not move food like octopus tentacles. Option a is wrong as villi are not cell extensions. Option c is about microvilli but the statement about villi in option a is wrong. Option d correctly states that the small intestine surface is enlarged on multiple levels with visible villi.

Answer:

d) The surface of the small intestine is enlarged on many levels. Here we can see the villi