Question 1:

Which molecule is the primary energy source for muscle contraction?

Explanation: The primary energy source for muscle contraction is ATP (adenosine triphosphate). ATP is produced through various metabolic processes and is readily available for muscle cells to utilize during contraction.

Question 2:

Which metabolic process occurs in the absence of oxygen and produces lactic acid?

Explanation: The metabolic process that occurs in the absence of oxygen and produces lactic acid is glycolysis. During intense exercise or in situations where oxygen supply is limited, glycolysis helps generate ATP quickly but with the byproduct of lactic acid.

Question 3:

Which molecule is stored in muscle cells to provide a rapid source of ATP during high-intensity exercise?

Explanation: Creatine phosphate is stored in muscle cells and serves as a rapid source of ATP during high-intensity exercise. Creatine phosphate donates a phosphate group to ADP, regenerating ATP for immediate energy use.

Question 4:

Which process involves the breakdown of glycogen into glucose for energy production?

Explanation: The process that involves the breakdown of glycogen into glucose for energy production is glycogenolysis. During periods of increased energy demand, such as exercise, glycogen stored in muscles and liver is broken down to release glucose.

Question 5:

Which metabolic process utilizes fatty acids as a source of energy for prolonged, low-intensity exercise?

Explanation: The metabolic process that utilizes fatty acids as a source of energy for prolonged, low-intensity exercise is oxidative phosphorylation. This process occurs in the mitochondria and involves the breakdown of fatty acids to produce ATP.