Final answer:
Exhaustion is the condition involving excessive fatigue, physical aches, and reduced mental alertness, often following prolonged stress or health issues such as anemia.
Step-by-step explanation:
The condition that involves excessive fatigue, often marked by physical aches and reduced mental alertness is known as Exhaustion. This stage of exhaustion follows a long-term exposure to stressors, where the body is no longer able to adapt and resist the stress, leading to symptoms such as severe fatigue, depression, suppression of the immune response, and even serious health conditions. Factors contributing to exhaustion can include ongoing stress, like in cases of job burnout, or health conditions such as anemia, which reduces the oxygen-carrying capacity of the blood, causing weakness and fatigue.