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Exercise Metabolism: Muscle Contraction Energetics and Metabolic Responses

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Questions and Answers

What is the main molecule that provides energy for muscle fibers to contract?

Phosphocreatine
Glucose
Lactic acid
Adenosine Triphosphate (ATP) (correct)

What is the primary fuel source for high-intensity muscle contraction lasting around 30 seconds to 3 minutes?

Glucose (correct)
Amino acids
PCr (phosphocreatine)
Fatty acids

What is the mechanism through which creatine supplements provide energy for high-intensity muscle contraction?

Anaerobic glycolysis
Fatty acids metabolism
Phosphocreatine (PCr) system (correct)
Aerobic metabolism

What byproduct was previously thought to cause fatigue and muscle soreness but is now believed to provide an additional fuel source?

Lactic acid (A) Signup and view all the answers

What is used as an index of aerobic ATP production within the body?

VO2 max (B) Signup and view all the answers

What is the main difference between the use of fat and carbohydrates as fuel in human metabolism?

Fat is the primary fuel for endurance activities, while carbohydrates are the primary fuel for high intensity activities. (B) Signup and view all the answers

What is the role of PCr (phosphocreatine) in exercise metabolism?

PCr is utilized as fuel for fast accelerations during exercise. (A) Signup and view all the answers

What is the significance of estimating fuel utilization in exercise metabolism?

It helps in determining the precise amount of energy expended during different types of exercises. (B) Signup and view all the answers

How do muscle contraction energetics differ during rest and exercise transitions?

During rest, ATP is primarily generated through oxidative phosphorylation, while during exercise transitions, ATP production shifts to anaerobic glycolysis. (A) Signup and view all the answers

Why do foods provide varying levels of nutrition for their calorie content?

Different foods have different macronutrient compositions, leading to variations in nutrition per calorie. (A) Signup and view all the answers

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