1) Muscle tone is the result of: a) asynchronous firing of motor units b) incomp

Question

1) Muscle tone is the result of:

     a) asynchronous firing of motor units

     b) incomplete tetanus.

     c) multiple muscle twitches.
     d) multiple motor unit summation.

2) Under normal circumstances, at the level of single skeletal muscle fibers, there are:

     a) all-or-nonr responeses

     b) graded contractions, depending on stimulus input

   c) rapid spasmodic contractions, resulting in the main contraction

3) The muscles of the eye need to make precise small motor movements. Therefore, you would find large motor units in the eye, while you would find small motor units in postural muscle such as the thigh.

     a) True

     b) False

Explanation / Answer

1). Muscle tone is the characteristic property of muscle fibres, which help the muscle for immediate contraction. Muscle tone is a result of random asynchronous contraction of motor units.

Thus, the correct option is (a) asynchronous firing of motor units.

2).Under normal circumstances, muscles and neurons exhibit all or none principle. i.e., only after reaching the threshold potential difference, they will respond, below threshold they do not respond at all. after, excitatoin muscles exhibit graded responses.

Thus, the correct option is (a) all or none.

3) False

Eyes need precise movement but little strength. For example, the extraocular muscles (motor units) are vey small.

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