Absorption

Question 1

Absorption

Answer 1

Occurs in different ways:

1. Simple diffusion
2. Facilitated diffusion
3. Active transport

Question 2

Absorption: Facilitated Diffusion

Answer 2

• no energy needed
• carrier needed
• carries the nutrients into the cells
• (water soluble vitamins)

Question 3

Absorption in the Small Intestines

Answer 3

• inside the intestines, the walls are folded (ridged)
• projected from these ridged “hills” are villi
• projecting from the villi are microvilli
• the circulatory system (capillaries) run directly beneath the outer cell wall of the villi
• nutrients absorbed from the intestines into the capillaries of the villi

Question 4

Absorption: Simple Diffusion

Answer 4

• no energy or carriers needed
• just passes through the cell walls
• water and small lipids

Question 5

Absorption: Active Transport

Answer 5

• energy needed
• carrier needed
• energy “fuels” the carrier
• glucose, amino acids

Question 6

Final Stage: Elimination

Answer 6

• stools
• what is not absorbed, or not needed anymore
• eliminated