Feeding and Fasting With Cases

Question 1

You cannot turn fat into __________.

Answer 1

sugar, but you can convert them into ketones, which the brain can use

Question 2

What inhibits pyruvate kinase? (Think of the pathway.)

Answer 2

Protein kinase Aphosphorylating it – stimulated by the rise in glucagon.

This occurs because you don’t want PEP converted to pyruvate if you’re performing gluconeogenesis.

Question 3

The only tissue that contains glycerol kinase is ___________.

Answer 3

the liver (because it’s the only one that can perform gluconeogenesis to supply the body)

Question 4

What is one reason the brain uses ketone bodies?

Answer 4

Because RBCs only use glucose, so having the brain rely on ketone bodies helps to save glucose for RBCs