[16] Concept of Substrate Cycling in Thermogenesis

Question 1

What does the term ‘substrate cycling’ refer to in thermogenesis?

Answer 1

It refers to the process where a metabolic pathway simultaneously synthesizes and breaks down a molecule, creating a cycle that produces heat.

Question 2

How does substrate cycling contribute to thermogenesis?

Answer 2

It creates heat by wasting metabolic energy in the form of ATP through simultaneous synthesis and breakdown of molecules.

Question 3

What is an example of substrate cycling in bioenergetics?

Answer 3

The simultaneous operation of the glycolysis and gluconeogenesis pathways in the liver is an example.

Question 4

What is the purpose of heat production through substrate cycling?

Answer 4

Heat production helps maintain the body temperature, especially in response to cold exposure.

Question 5

How does substrate cycling contribute to weight regulation?

Answer 5

By generating heat, substrate cycling burns excess calories, which can help control body weight.

Question 6

What is the relationship between substrate cycling and hormones like adrenaline?

Answer 6

Hormones like adrenaline can stimulate substrate cycling, leading to increased heat production and energy expenditure.

Question 7

Can substrate cycling be influenced by diet?

Answer 7

Yes, certain diets can influence the rate of substrate cycling and therefore the rate of energy expenditure.