Fat Burning Metabolism and Energy Systems

Question 1

What is the primary fuel source used during low-intensity aerobic exercise for fat burning?

Accepted Answer

Free fatty acids

Answer

During low-intensity aerobic exercise, the body primarily oxidizes free fatty acids because oxygen availability supports the slower but more efficient fat metabolism pathway.

Question 2

Which metabolic process breaks down stored triglycerides into free fatty acids and glycerol?

Accepted Answer

Lipolysis

Answer

Lipolysis is the metabolic process that hydrolyzes stored triglycerides into free fatty acids and glycerol, releasing them into the bloodstream for use as fuel.

Question 3

The 'fat-burning zone' is typically defined as what percentage of maximum heart rate?

Accepted Answer

60–70%

Answer

The fat-burning zone is generally 60–70% of maximum heart rate, where the body uses a higher proportion of fat relative to carbohydrates as fuel.

Question 4

Which organelle is the primary site of beta-oxidation of fatty acids?

Accepted Answer

Mitochondria

Answer

Mitochondria are the site of beta-oxidation, where fatty acids are cleaved into acetyl-CoA units that enter the Krebs cycle to generate ATP.

Question 5

Basal Metabolic Rate (BMR) accounts for approximately what percentage of total daily energy expenditure in a sedentary adult?

Accepted Answer

60–75%

Answer

BMR accounts for 60–75% of total daily energy expenditure, representing calories burned to maintain basic physiological functions at rest.

Fat Burning Practice Test

Fat Burning Practice Test

Fat Burning Metabolism and Energy Systems