🔸 Feeding and Fasting With Cases

Question 1

You cannot turn fat into […], but you can turn it into […] which the brain can use.

Answer 1

•sugar; •ketones

Question 2

[…] inhibits pyruvate kinase by […] it. (Think of the pathway.)

Answer 2

•PKA; •phosphorylating it.
(stimulated by the rise in glucagon).

We don’t want PEP converted to pyruvate if we’re performing gluconeogenesis.

Question 3

The only tissue that contains glycerol kinase is […].

Answer 3

•the liver

it’s the only one that can do gluconeogenesis to supply the body

Question 4

What is one reason the brain uses ketone bodies?

Answer 4

•RBCs only use glucose, thus the brain using ketone bodies helps save glucose for RBCs.

Question 5

In an overnight fast […] are high but they will decrease with food […].

Answer 5

• counter-regulatory hormones;

- intake

Question 6

Triglycerides provide energy substrates by being broken down into […] and […].

Answer 6

•Glycerol and FFA.

Question 7

The fate of glycerol and FFA respectively, after being broken off from T.G. is:

Answer 7

• Glycerol→ moves to liver to become glucose.

* FFA→ moves to muscle to be turned to Acetyl CoA and enter CAC.

Question 8

Skeletal muscle can admit what energy precursors?

Answer 8

• FFA,
• Ketone Bodies
• Glucose
• Glycogen (made within itself).

Question 9

If protein breakdown occurs for use as energy, where/how does it occur? (be broad).

Answer 9

•The protein breaks down into A.A. and is transported to hepatocytes to be turned into Pyruvate and Urea (Urea Cycle).

Question 10

With long term fasting, the blood […] will rise. This occurs due to breakdown of […].

Answer 10

•Ketones ; Fat