Exam 2: NMJ Communication

Skeletal

What type of muscle:

needs neural impulses to contract

Voluntary

Smooth

What type of muscle:

Contracts with motor neuron stimulation

In arteries

involuntary

Nerves

Muscles only contract when stimulated by _____

Sarcoplasmic reticulum

What part of the skeletal muscle is membrane bound and stores, releases, and retrieves calcium ions?

T-tubules

What part of the skeletal muscle has Ca++ receptors and neuromuscular conjunction happens there?

NMJ

_____ is the connection between the motor neuron and skeletal muscle cells (sarcolemma)

Motor endplate

__________(postsynaptic) – specialized portion of the sarcolemma of the skeletal muscle cells, coordinates muscle contraction

Allow the propagation of action potentials into the muscle fiber

What is the function of the T-tubules in muscle contraction?

Acetylcholinesterase

What enzyme breaks down acetylcholine in the synaptic cleft to terminate its action?

Calcium

Which ion is responsible for triggering the release of acetylcholine into the synaptic cleft?