9.4 Absorption and defecation

Question 1

What are the three segments of the small intestine?

Answer 1

Dow Jones Industrial

Duodenum, jejunum, ileum

Question 2

How is the lacteal situated in the villi?

Answer 2

it is right in the middle.

Question 3

How are small fats processed?

Answer 3

They can diffuse directly into the intestinal capillaries.

They do not require transporters because they are non-polar.

Question 4

How are large fats transported across membranes?

Answer 4

They move separately into the intestinal cells, but them reform into triglycerides.

These are then packaged into chylomicrons.

These can then enter into the lacteals.

Question 5

What are the four fat soluble vitamins?

Answer 5

A, D, E K

B & C are water-soluble.

Question 6

How is water absorbed (2 key vocab words)?

Answer 6

Transcellularly (across the cell membrane)
paracellularly (squeezing between the cells)

Question 7

What are the two circulatory vessels in a villus? What biomolecules are absorbed in each?

Answer 7

Capillaries: absorb water soluble nutrients like monosaccharides, amino acids, and short chain fatty acids, water-soluble vitamins, and water itself.

Lacteals: absorb fat-soluble nutrients, like fats, cholesterol, and fat soluble vitamins

Question 8

Vibrio causes massive water loss. Does it likely impact the small or large intestine?

Answer 8

The small intestine. Because it absorbs a much larger volume of water than the large intestine (paradoxical!)