Muscle Contraction Video Review

While cardiac muscle and smooth muscle is involuntary, skeletal muscle is considered....

Muscles are composed of bundles of muscle fibers. One muscle fiber equals 1____.

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NGSS.MS-LS1-1

NGSS.MS-LS1-2

One bundle of muscle fibers is called a_____.

To contract a muscle, the brain sends a signal through a motor neuron, which attaches to a muscles at a ________ junction.

The connection between a motor neuron and a muscle fiber is called a _______.

Muscle fibers are composed of long protein cylinders which are called_______.

A _______ is considered the contractile unit of a myofibril, or the part that shrinks during a contraction.

A sarcomere mere is composed of overlapping ____ filaments and thin filaments.

Thick filaments contain ______ proteins.

actin thin filaments are anchored to the __ line.