Nutrition in Human (Absorption and Functions of Liver)

Where does absorption take place in the alimentary canal? Check all that apply.

• Mouth

• Oesophagus

• Small Intestine

• Large Intestine

After a heavy meal, how is glucose absorbed from the lumen of the small intestine into blood?

• active transport

• diffusion

• osmosis

After fasting, how is glucose absorbed from the lumen of the small intestine into blood?

• active transport

• diffusion

• osmosis

In what ways are the small intestine adapted for absorption? Check all that apply.

• It is long.

• It has numerous inner folds called villi.

• It is highly vascularised.

• It has circular and longitudinal muscles that enable peristalsis to occur.

• The intestinal wall is one-cell thick.

In what ways is a villus adapted for absorption? Check all that apply.

• It is long.

• Cells making up the epithelial wall have microvilli that increase the surface area to volume ratio.

• It is highly vascularised.

• Its wall is one-cell thick.

What does it mean when we say that villi are highly vascularised?

• Villi contains many vascular bundles.

• Villi contains many blood vessels.

What is the advantage of having a one-cell thick wall for absorption?

• Molecules can squeeze through easily.

• Molecules have a shorter distance to travel, so rate of absorption is faster.

• One-cell thick wall is permeable, so all molecules can pass through easily.

Why must the villi be highly vascularised?

• To transport absorbed nutrients away from the small intestines quickly, so as to maintain a steep concentration gradient for diffusion and osmosis to occur quickly

• To transport absorbed nutrients away from the small intestines quickly, so as to maintain a steep concentration gradient for diffusion, osmosis and active transport to occur quickly

• To transport absorbed nutrients towards the small intestines quickly, so as to maintain a steep concentration gradient for diffusion and osmosis to occur quickly

• so that cells of the small intestine receive a lot of oxygen

Which of these nutrients are absorbed in the small intestine? Check all that apply.

• cellulose

• mineral salts

• amino acids

• maltose

• water

Which of these nutrients are absorbed in the small intestine? Check all that apply.

• fatty acids and glycerol

• galactose

• vitamins

• sucrose

• glycogen