Question

place a single word or phrase into each sentence to correctly explain the relationship between stimulus intensity and muscle tension. 1. subthreshold stimuli produce no muscle click to select. 2. when stimuli reach or exceed click to select, they excite more motor units. 3. the more motor units that are excited, the click to select the contraction. 4. when multiple motor units are excited, it is called click to select. 5. when all nerve fibers are stimulated, an increase in stimulus strength will produce no click to select in muscle tension. contraction decrease increase relaxation stronger summation threshold weaker

Explanation:

1. Subthreshold stimuli are too weak to trigger muscle contraction.
2. When stimuli reach the threshold level, they can activate more motor - units.
3. More excited motor - units lead to a stronger muscle contraction.
4. Activation of multiple motor - units is called summation.
5. Once all nerve fibers are stimulated, further increasing stimulus strength won't increase muscle tension.

Answer:

1. contraction
2. threshold
3. stronger
4. summation
5. increase