A&P 1 Final Review

Front

How do skeletal muscles contract?

Back

The myofilaments move closer to each other shortening the sarcomere.

Front

Which relaxes faster, skeletal muscle or smooth muscle?

Back

Skeletal muscle.

Front

Which filament is the thick filament?

Back

Myosin.

Front

Which regulatory protein in a skeletal muscle fiber needs to bind calcium to activate?

Back

Troponin.

Front

True or False: Cardiac muscle requires more mitochondria than skeletal muscle because cardiac muscle contracts more often.

Back

True.

Front

What is the role of actin in muscle contraction?

Back

Actin is a thin filament that interacts with myosin to facilitate muscle contraction.

Front

What is the function of myosin in muscle contraction?

Back

Myosin is a thick filament that pulls on actin to shorten the muscle fiber.

Front

Define sarcomere.

Back

The sarcomere is the basic contractile unit of muscle tissue, defined by the area between two Z lines.

Front

What is the role of tropomyosin in muscle contraction?

Back

Tropomyosin blocks the binding sites on actin, preventing contraction until calcium binds to troponin.

Front

Explain the sliding filament theory.

Back

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