Muscles III

Front

What is the fastest way to regenerate ATP during muscle activity?

Back

Direct phosphorylation of ADP by creatine phosphate.

Front

What is the function of creatine phosphate (CP) in muscle cells?

Back

Creatine phosphate stores energy that will be transferred to ADP to resynthesize ATP as needed.

Front

What is a muscle group that assists the action of a prime mover called?

Back

Synergist.

Front

What event must occur first to trigger skeletal muscle contraction?

Back

Acetylcholine (ACh) causes temporary permeability to sodium.

Front

What is a single, brief, jerky muscle contraction called?

Back

Twitch.

Front

Define 'direct phosphorylation' in the context of muscle energy.

Back

A process where creatine phosphate donates a phosphate group to ADP to form ATP quickly.

Front

What role does acetylcholine play in muscle contraction?

Back

It binds to receptors on the muscle cell membrane, causing sodium channels to open and initiate an action potential.

Front

What is the difference between isotonic and isometric contractions?

Back

Isotonic contractions involve muscle shortening and movement, while isometric contractions involve muscle tension without shortening.

Front

What is the role of sodium ions in muscle contraction?

Back

Sodium ions rush into the muscle cell, depolarizing the membrane and triggering an action potential.

Front

What is a fixator muscle?

Back

A muscle that stabilizes the origin of the prime mover, allowing for efficient movement.