Human Anatomy&Phpslog; 5. Describe 2 or 3 physiological processes occurring in t

Question

Human Anatomy&Phpslog; 5. Describe 2 or 3 physiological processes occurring in the muscle fibers that might account for the gradual onset of muscle fatigue. 6. Most subjects use their dominant forearm far more than their non-dominant forearm. What does this indicate about degree of activation of motor units and these three factors: muscle fiber diameter, maximum muscle fiber force and time to muscle fatigue? Specifically do you expect cell diameter, maximum force and time to fatigue to be increased or decreased in the dominant forearm compared to the non-dominant forearm? a) (Circle one): Cell diameter would be increased or decreased in the dominant forearm compared to the non-dominant forearm. b) (Circle one): Maximum force would be increased or decreased in the dominant forearm compared to the non-dominant forearm c) (Circle one): Time to fatigue would be increased or decreased in the dominant forearm compared to the non-dominant forearnm

Explanation / Answer

5. The physiological processes leading to muscle fatigue are:-

Depletion of glycogen and accumulation of lactic acid- In case of adequate oxygen supply to muscle, they have the energy for contraction but in lack of oxygen, lactic acid is produced which causes muscle pain and fatigue. This occurs due to depletion of substances during exercise or other physical work.

Fatigue also occurs due to nerve which are responsible for contraction of muscles. In extremely powerful contractions, nervous fatigue occurs which leads to weakening of nerve signal.

6. 1. The dominant forearm has increased diameter compared to non dominant arm as the former are most extensively used.

2. The non dominant forearm have maximum force compared to dominant as there is delay due to increased percentage of slow twitch fibres.

3. The non dominant forearm fatigues faster because there is increase in diameter of each muscle fibre in dominant arm and it is difficult to recruit more muscle fibre for non dominant in short time interval.

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