2024 - 5 Muscle Physiology - Honors

Front

What does calcium attach to once it is released during muscle contraction?

Back

Calcium attaches to troponin.

Front

What is the name for the light band on a sarcomere?

Back

I-Band.

Front

True or False: When a motor unit contracts, it always FULLY contracts; there is no half contraction.

Back

True.

Front

What connective tissue covers each individual muscle fiber?

Back

Endomysium.

Front

What connective tissue covering separates muscle tissue into fascicles?

Back

Perimysium.

Front

What is the role of troponin in muscle contraction?

Back

Troponin binds calcium ions, causing a conformational change that allows myosin to bind to actin.

Front

What is the function of tropomyosin in muscle fibers?

Back

Tropomyosin blocks the binding sites on actin for myosin, preventing contraction when calcium is not present.

Front

What is the structural unit of a muscle called?

Back

Sarcomere.

Front

What is the role of myosin in muscle contraction?

Back

Myosin heads bind to actin filaments and pull them, causing muscle contraction.

Front

What is the difference between the A-band and I-band in a sarcomere?

Back

The A-band contains the entire length of myosin filaments, while the I-band contains only actin filaments.