Microscopic Anatomy of a Skeletal Muscle

Front

What protein comprises the thick filament in skeletal muscle?

Back

Myosin

Front

What is composed mostly of the protein myosin?

Back

Thick filaments

Front

What is the thin filament in muscle tissue?

Back

Actin

Front

What is the endoplasmic reticulum in a muscle cell called?

Back

Sarcoplasmic reticulum

Front

What is the H zone in skeletal muscle?

Back

The H zone, located within the A band, lacks thin filaments.

Front

What are the two main types of filaments in skeletal muscle?

Back

Thick filaments (myosin) and thin filaments (actin).

Front

What is the role of troponin in muscle contraction?

Back

Troponin binds calcium ions and helps regulate muscle contraction.

Front

What is the function of tropomyosin in muscle fibers?

Back

Tropomyosin blocks the binding sites on actin for myosin, preventing contraction.

Front

What is the A band in skeletal muscle?

Back

The A band is the region that contains both thick and thin filaments.

Front

What is the I band in skeletal muscle?

Back

The I band is the region that contains only thin filaments.