Anatomy 9b Muscle Contractions

Front

What is the contractile unit formed from Z line to Z line?

Back

Sarcomere

Front

What is the point where an axon terminal of a nerve cell and the sarcolemma of a skeletal muscle join?

Back

Neuromuscular junction

Front

What attaches to actin to form the cross bridge?

Back

Myosin

Front

What does calcium attach to in order to allow a muscle contraction?

Back

Troponin

Front

What is the myosin protein classified as?

Back

Thick filament

Front

What is the role of the sarcoplasmic reticulum in muscle contraction?

Back

It stores and releases calcium ions.

Front

What is the function of tropomyosin in muscle contraction?

Back

It blocks the binding sites on actin for myosin.

Front

What is the role of acetylcholine in muscle contraction?

Back

It transmits the nerve signal to the muscle fiber at the neuromuscular junction.

Front

What is the energy source for muscle contraction?

Back

ATP (Adenosine Triphosphate)

Front

What is the sliding filament theory?

Back

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