3.3 DIGESTION AND ABSORPTION

Question 1

describe absorption and transport of digested lipid molecules from the ileum into lymph vessels

Answer 1

1. micelles contain bile salts and fatty acids
2. make fatty acids/monoglycerides more soluble in water / bring fatty acids/monoglycerides to the cell lining of the ileum
3. fatty acids absorbed by diffusion
4. triglycerides reformed in cells
5. vesicles move to cell membrane

Question 2

function of ATP hydrolase in absorption in the ileum

Answer 2

1. releases energy
2. allows active transport of ions

Question 3

role of the golgi apparatus in absorption of lipids

Answer 3

1. modifies/processes triglycerides
2. combines them with proteins
3. packages them into vesicles so they can exocytose

Question 4

describe the absorption fo glucose by co-transport with sodium ions

Answer 4

1. sodium ions are actively transported out of the ileum cells to the blood
2. establishing a concentration gradient
3. glucose goes through facilliated diffusion into the epithelial cells