Muscular System - Test Review

Front

Region where a motor neuron comes in close contact with a muscle cell.

Back

neuromuscular junction

Front

The neurotransmitter stored in the axon terminal and released at a neuromuscular junction

Back

Acetylcholine (ACh)

Front

What happens immediately after the action potential is distributed throughout the T-tubules?

Back

Calcium is released from the sarcoplasmic reticulum

Front

Calcium is stored in the ___.

Back

sarcoplasmic reticulum

Front

Calcium:

Back

triggers the binding of myosin to actin

Front

The functional unit of a muscle that contracts is ...

Back

sarcomere

Front

Actin is the ...

Back

Thin filament within a muscle fiber

Front

Myosin is the ...

Back

Thick filament of a muscle fiber

Front

What happens to the sarcomeres during contraction?

Back

They shorten.

Front

True or False: Calcium ions bind to regulatory proteins, change their shape and cause the actin active sites to be exposed.

Back

True