Q.Explain short term effects of exercise on muscular system

Muscle Hypertrophy Mechanism

Lift something heavier than your muscles are used to, day after day, and eventually the muscle itself grows. That growth is called hypertrophy, and it is one of the long-term effects of exercise on the muscular system — the mechanism is really a repeated cycle of stress, damage, and repair.

The Cycle, Step by Step

1. Overload. When a muscle is asked to work against a load heavier than it normally handles, the individual muscle fibres are placed under mechanical tension beyond their everyday range.

2. Micro-tears. This tension causes tiny, microscopic tears in the muscle fibres. This is a normal, expected part of training — it is one of the short-term effects of exercise on the muscular system, alongside increased blood supply, muscle temperature, flexibility, and a build-up of lactate that contributes to post-exercise soreness.

3. Repair and overcompensation. The body responds to this micro-damage by repairing the fibres. Crucially, it does not simply restore them to their original thickness — it rebuilds them slightly thicker, so the same load produces less damage next time. This overcompensation is what drives visible growth over weeks of training.

4. Structural adaptation. Repeated cycles of this kind produce the full set of long-term muscular adaptations: hypertrophy of the muscle itself, increased strength of the ligaments and tendons attached to it, an increase in the size and number of mitochondria (the fibres' energy-producing structures), greater myoglobin storage (which carries oxygen inside the muscle), increased glycogen storage (the muscle's fuel reserve), improved oxidation and fat metabolism, and a higher tolerance for lactic acid build-up. …