The major function of the sarcoplasmic reticulum in muscle contraction is to :

Interpretation of sensory input.

Monitoring stimuli occurring inside and outside the body.

Anchor neurons to their nutrient supplies.

Wrap CNS nerve fibers.

Synaptic cleft is a space between the motor end-plate and the sarcolemma. The importance of this neuro-muscular junction is notable except:

The receptive or input region of the neuron.

Smooth muscle tissue is characterized or described by the following except:

Fine sheath of connective tissue composed of reticular fibers surrounding each muscle fiber.

An isotonic contraction where the muscle shortens and does work.