Muscular System STRUCTURE

Front

What are thick filaments?

Back

Thick filaments are primarily composed of myosin, a protein that plays a crucial role in muscle contraction.

Front

What is the M line?

Back

The M line is the center of the H zone where the attachment site for thick filaments is located.

Front

Which type of muscle is under our conscious/voluntary control?

Back

Skeletal muscle is the type of muscle that is under conscious or voluntary control.

Front

What is the Z disc?

Back

The Z disc is the midline of the I band that tethers the thin filaments.

Front

What is endomysium?

Back

Endomysium is a connective tissue that encloses individual muscle fibers.

Front

What are thin filaments?

Back

Thin filaments are primarily composed of actin, along with troponin and tropomyosin, and are essential for muscle contraction.

Front

What is the role of troponin in muscle contraction?

Back

Troponin is a protein that binds to calcium ions and helps regulate muscle contraction by moving tropomyosin away from actin binding sites.

Front

What is the function of tropomyosin?

Back

Tropomyosin is a protein that blocks the binding sites on actin filaments, preventing muscle contraction when calcium is not present.

Front

What is the I band in muscle fibers?

Back

The I band is the region of a sarcomere that contains only thin filaments and is lighter in appearance.

Front

What is the A band in muscle fibers?

Back

The A band is the region of a sarcomere that contains both thick and thin filaments and is darker in appearance.