If a stretch reflex is activated, the muscle will   a. lengthen.   b. relax.   c. shorten.   d. none of above

Muscle tone A. is too high in children with Down syndrome. B. is lower than normal in the flexors of cats with decerebrate rigidity. OC. is mediated by the stretch reflex. OD. increases as a result of training, especially weightlifting. E. is treated with L-dopa.

Which of the following correctly lists the structures that make up a motor unit? a. motor neuron plus some of the muscle fibers it innervates b. motor neuron plus all of the muscle fibers it innervates c. motor neuron plus one of the muscle fibers it innervates d. all of the above e. none of the above

The Interstitial Cells of Cajal (ICC) generate "slow waves" which refer to A. slow action potentials. OB. phasic contractions. C. tonic contractions. D. oscillating resting membrane potentials. OE. oscillating release of paracrine factors. in smooth muscle.