absorption of lipids

Question 1

what is the first 2 steps of the absorption of lipids

Answer 1

fatty acids and monoglycerides are emulsified by the bile salts, forming micelles. the micelles then enter the epithelial cells and link to form triglycerides

Question 2

step 3

Answer 2

the tri glycerides then combine with the proteins from the golgi body to form chylomicrons

Question 3

final step

Answer 3

the chylomicrons then enter the lacteal and are transported away from the intestine

Question 4

define co transport

Answer 4

the coupled movement of substances across a cell membrane with the use of carrier proteins. this uses facilitated diffusion aswel as active transport

Question 5

describe the cotransport of glucose molecules and sodium ions in epithelial cells

Answer 5

the sodium ions and glucose molecules are transported to the epithelial cells via facilitated diffusion, however this is only possible if a concentration gradient is maintained, so the sodium ions are actively transported out of the cell. the glucose molecules then exit into the blood via facilitated diffusion.

Question 6

define facilitated diffusion

Answer 6

the passive movement of molecules along a concentration gradient