What is the primary molecule used by muscles for immediate energy?Group of answer choicesGlycogen.Fatty acids.ATP.Glucose.

Break Down the Problem

1. Identify the primary molecules involved in muscle metabolism.
2. Determine which molecule provides immediate energy during muscle contraction.

Relevant Concepts

• Adenosine Triphosphate (ATP): The primary energy carrier in biological systems, necessary for muscle contraction.
• Glycogen: A stored form of glucose that can be converted to glucose when energy is needed.
• Fatty Acids: Used during prolonged exercise or at rest, but not typically for immediate energy.
• Glucose: A simple sugar that can be used for energy but is not as immediate as ATP.

Analysis and Detail

• ATP is directly utilized by muscle fibers during contraction. It is readily available in muscle cells.
• Glycogen is broken down into glucose, which can also produce ATP, but it requires additional steps.
• Fatty acids are not utilized for immediate energy and require oxygen for breakdown.
• While glucose is vital for energy, it must first be converted from glycogen in a process that is not instantly available compared to direct ATP usage.

Verify and Summarize

The muscles utilize ATP for immediate energy needs. Glycogen and glucose require conversion to ATP, and fatty acids are slower to mobilize.

Final Answer

The primary molecule used by muscles for immediate energy is ATP.