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Questions and Answers
During prolonged low-intensity exercise lasting for more than 40-50 minutes, what is the major energy substrate for muscle?
During prolonged low-intensity exercise lasting for more than 40-50 minutes, what is the major energy substrate for muscle?
- Proteins
- Triglycerides
- Fatty acids (correct)
- Carbohydrates
How can muscle cells obtain fatty acids?
How can muscle cells obtain fatty acids?
- Through conversion of carbohydrates
- Through hydrolysis of triglycerides
- Through uptake from blood (correct)
- Through synthesis within the mitochondria
What is the first step in the process of fatty acids entering the mitochondria for β oxidation?
What is the first step in the process of fatty acids entering the mitochondria for β oxidation?
- Conversion to acetyl CoA
- Conversion to acylcarnitine (correct)
- Conversion to acyl CoA
- Transportation into the mitochondria
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Study Notes
Energy Substrate for Muscle During Prolonged Exercise
- During prolonged low-intensity exercise lasting for more than 40-50 minutes, the major energy substrate for muscle is fatty acids.
Fatty Acid Uptake by Muscle Cells
- Muscle cells can obtain fatty acids from the bloodstream, where they are bound to albumin.
- Fatty acids can also be released from stored triglycerides in adipose tissue.
Fatty Acid Entry into Mitochondria for β Oxidation
- The first step in the process of fatty acids entering the mitochondria for β oxidation is the activation of fatty acids to form acyl-CoA by the enzyme acyl-CoA synthase.
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