GI tract Lecture 4 - Teel

Question 1

Ghrelin

Leptin

Answer 1

Ghrelin: Produced in stomach, stimulates appetite

Leptin: Produced in Fat cells, stimulates satiation

CCK: Inhibitor of appetite, due to end products of this being glucose, AAs, FAs, these nutrients act as inhibitors.

Question 2

Mechanisms of Fructose:

Answer 2

Induces insulin resistance. (Body does not respond to activities of insulin)
Increases circulating tri-glycerides
Induces leptin resistance. (leptin stimulates satiation, so resisting it makes u more hungry)
Postprandial (after mealtime), circulating Ghrelin levels fall
Lowers postprandial circulating leptin and insulin

Question 3

Active absorption involves co-transport with Na+. Which of the following is not actively absorbed with Na+?
A. fe2+
B. Glucose
C. Primary Bile Acids
D. Certain AAs
E. Vitamin C

Answer 3

A.

Fe2+ cotransported with H+, not Na+.