Muscular System Review

Skeletal muscle is the only voluntary muscle type in the human body.

Sarcomeres are the repeating contractile units that make up myofibrils, which are found in muscle fibers.

The perimysium is a connective tissue sheath that surrounds fascicles (bundles of muscle fibers).

Botulism is caused by a toxin that inhibits acetylcholine, a neurotransmitter essential for muscle contraction.

Lactic acid is a byproduct of glucose breakdown during prolonged exercise without adequate rest.

The three types of muscle tissue are skeletal, smooth, and cardiac.

Skeletal muscle is responsible for voluntary movements and is attached to bones.

Acetylcholine is a neurotransmitter that transmits signals from nerves to muscles, triggering contraction.

Smooth muscle is involuntary and found in organs, while cardiac muscle is involuntary and found in the heart.

The epimysium is a connective tissue layer that surrounds the entire muscle.