Question

multiple choice question

during short bursts of intense activity, atp for muscle contraction is supplied by which of the following?

• creatine phosphate
• adp
• fatty acids
• aerobic metabolism

Explanation:

Identify the metabolic demands of short bursts of intense activity

Using the Exercise Duration Effects and Muscle Energy Systems knowledge points
During short, high-intensity bursts of exercise (lasting up to about 10 seconds), the muscles require immediate energy at a rate that exceeds the capacity of aerobic pathways.

Evaluate the role of immediate energy systems

Using the Phosphagen System and ATP Source Regulation knowledge points
The phosphagen system provides immediate ATP through the transfer of a phosphate group from creatine phosphate to ADP, catalyzed by creatine kinase. This reaction is extremely rapid and does not require oxygen, making it the primary source of ATP during the initial seconds of intense muscle contraction.

Analyze the incorrect options

• ADP: ADP is a product of ATP hydrolysis, not a direct fuel source that supplies ATP.
• Fatty acids: Fatty acids are metabolized via aerobic pathways, which are too slow to meet the immediate demands of short, explosive bursts.
• Aerobic metabolism: Aerobic respiration requires oxygen and is highly efficient but slow to activate, serving as the primary ATP source for prolonged, lower-intensity activities.

Answer:

• (A) Creatine phosphate (Correct answer)
• (B) ADP
• (C) Fatty acids
• (D) Aerobic metabolism