Loss of endurance during middle adulthood results from a gradual decrease in the rate of

A) physical capacity.
B) basal metabolism.
C) stress-induced stamina.
D) reaction time.

Basal Metabolism

Use of energy to maintain vital functions.

Physical Capacity

The maximum level of physiological activity that an individual can sustain, often influenced by factors like strength, endurance, and flexibility.

Stress-Induced Stamina

The capacity to endure stress while maintaining performance, which can improve with exposure to controlled levels of stress.