Many motor units in a muscle are stimulated in quick succession. what will most likely happen

Tetanus Contraction

Explanation:

When the motor units in a muscle undergo rapid stimulation without any relaxation in between then the muscle fiber re-stimulate. Since the contractile activity remains with in the muscle fiber, the contractile force sum up.

In case if the stimulation is extremely rapid  then muscle do not get enough time to remove all calcium from the sarcoplasm and hence a strong contraction occurs which is some cases can be extremely serious thereby leading to occurrence of sustained contraction called tetanus occurs

the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

hope i

-lavira: )

we would need to see the picture to answer it