chimpanzees and humans are very similar in many ways including skeletal muscle s

Question

chimpanzees and humans are very similar in many ways including skeletal muscle structure but chimpanzees are able to generate at least twice the force as humans of the same mass. An additional difference is that humans have much greater fine motor control. Current hypotheses describing these differences are that chimpanzees have fewer motor units for given number of muscle fibers and human central nervous systems put a limit on the number of motor units that many be stimulated at one time. explain these physiological differences between humans and chimpanzees using the hypotheses mentioned above.

Explanation / Answer

Motor neurons connect muscle fibres and regulates the motor function in the muscles. The spinal cord of Chimpanzee has less grey mater than human. The grey mater is directly proportional to the number of motor neurons.

When there is more motor neurons it will be divided with fine nerves and hence more muscle control. In order to finish a task human will trigger only limited muscle fibers.

Chimps have less motor neurons and hence triggers more muscle fibers to do a task. So it is an all or nothing Principle. They end up using all the muscles to do a task. This they are more powerful and end up with a larger force than human.

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