Quiz 5 Neuromuscular Junction, Skeletal Muscle and Contraction

The functional unit of skeletal muscle is the _________________.

Sarcomere

Increasing the amount of acetylcholinesterase will alter the communication at the Neuromuscular junction by ________________.

Decreasing the amount of acetylcholine linking to protein receptors on the postsynaptic surface.

The synapse is made of _____________________________.

- Postsynaptic terminal

- Presynaptic terminal (axon terminal button)

- Synaptic cleft

A motor unit refers to _____________________________.

a single motor neuron plus all of the muscle fibers it innervates.

Is this statement True or False: Muscle contraction can occur in a patient who has suddenly (accident-induced) lost nerve innervation to a muscle cell by injecting acetylcholine into the area next to the affected muscle. This is because the injected acetylcholine can still link to receptors on the muscle surface (neuromuscular junction site).

True

Muscle cells do not have action potentials.

False

Which component of the Skeletal muscle cell is responsible for storing intracellular Ca+2?

Smooth Sarcoplasmic Reticulum

Identify which listed protein(s) are important in the construction of the Actin filament.

Troponin complex

Why do cells, like Skeletal muscle cells, have a membrane potential difference?

To get work done that the cell requires to survive

Regarding the generation of force in a single skeletal muscle cell, which statement below is not true?

With each stimulation of the muscle cell the amount of free calcium in the cell increases.

Increasing the frequency of action potentials will increase the frequency of twitches.

Skeletal muscle twitch duration allows for summation of twitch force.

- A single, powerful action potential is necessary to maximize force.