Anatomy Final Exam Review

Front

What triggers a skeletal muscle to contract?

Back

The release of acetylcholine triggers a skeletal muscle to contract.

Front

What binds to receptors on the sarcolemma during the neuromuscular junction process?

Back

Acetylcholine (ACh) binds to receptors on the sarcolemma.

Front

Which myofilament is attached to the Z line?

Back

Actin is the myofilament attached to the Z line.

Front

What happens to the A band during the contraction of a sarcomere?

Back

The A band remains the same length during the contraction of a sarcomere.

Front

When a sarcomere contracts, where does actin move?

Back

Actin moves closer to the M line when a sarcomere contracts.

Front

What is the role of calcium ions (Ca2+) in muscle contraction?

Back

Calcium ions (Ca2+) play a crucial role in muscle contraction by binding to proteins that facilitate the interaction between actin and myosin.

Front

Define the term 'sarcomere'.

Back

A sarcomere is the basic contractile unit of muscle tissue, defined as the segment between two Z lines.

Front

What is the function of myosin in muscle contraction?

Back

Myosin is a motor protein that interacts with actin to produce muscle contraction.

Front

What is the significance of the M line in a sarcomere?

Back

The M line is the center of the sarcomere where myosin filaments are anchored.

Front

Explain the sliding filament theory of muscle contraction.

Back

The sliding filament theory states that muscle contraction occurs when actin filaments slide over myosin filaments, shortening the sarcomere.