Muscular System Anatomy

Front

What does the epimysium cover?

Back

The epimysium covers the entire muscle.

Front

Are skeletal muscles voluntary?

Back

True

Front

What is the specific neurotransmitter that stimulates the movement of skeletal muscles?

Back

Acetylcholine.

Front

What occurs at the neuromuscular junction?

Back

A nerve signal traveling down a motor neuron can jump over to the muscle cell.

Front

What is the thick filament composed of?

Back

Myosin.

Front

What is the function of the sarcoplasmic reticulum in muscle cells?

Back

The sarcoplasmic reticulum stores calcium ions, which are released during muscle contraction.

Front

What are the two main types of muscle fibers?

Back

The two main types of muscle fibers are slow-twitch (Type I) and fast-twitch (Type II) fibers.

Front

What is the role of actin in muscle contraction?

Back

Actin is a thin filament that interacts with myosin to facilitate muscle contraction.

Front

What is the sliding filament theory?

Back

The sliding filament theory explains how muscles contract by the sliding of actin and myosin filaments over each other.

Front

What is a motor unit?

Back

A motor unit consists of a motor neuron and all the muscle fibers it innervates.