Muscle Contraction Steps

Front

What opens the ligand gated sodium/potassium channel?

Back

Acetylcholine binding to the channel protein.

Front

Which is more true to cause muscle contraction?

Back

Myosin Pulls on Actin.

Front

What is the role of mitochondria in muscle contraction?

Back

Synthesis of ATP.

Front

What must calcium bind to in order for tropomyosin to change conformation?

Back

Troponin Protein.

Front

Which ion is NOT critical to muscle contraction?

Back

Phosphorus Ion.

Front

What is the primary function of myosin in muscle contraction?

Back

Myosin pulls on actin filaments to cause contraction.

Front

What is the role of calcium ions in muscle contraction?

Back

Calcium ions bind to troponin, causing tropomyosin to move and expose binding sites on actin.

Front

What is the function of acetylcholine in muscle contraction?

Back

Acetylcholine binds to receptors on the muscle cell membrane, triggering an action potential.

Front

What is the sliding filament theory?

Back

The theory that muscle contraction occurs by the sliding of actin filaments over myosin filaments.

Front

What is the role of ATP in muscle contraction?

Back

ATP provides the energy required for myosin to pull actin and for muscle relaxation.