Muscle Anatomy

Front

What is the connective tissue that surrounds individual muscle fibers?

Back

Endomysium

Front

What is the connective tissue that surrounds a fascicle of muscle fibers?

Back

Perimysium

Front

What is the outermost layer of connective tissue that surrounds an entire muscle?

Back

Epimysium

Front

What is the functional unit of a muscle fiber that contracts?

Back

Sarcomere

Front

What are the two main types of myofilaments in muscle fibers?

Back

Actin and Myosin

Front

What is the role of troponin in muscle contraction?

Back

Troponin binds calcium ions and helps regulate muscle contraction by moving tropomyosin away from actin binding sites.

Front

What is the role of tropomyosin in muscle contraction?

Back

Tropomyosin blocks the binding sites on actin filaments, preventing contraction until calcium ions bind to troponin.

Front

What is the structure that transmits the action potential into the muscle fiber?

Back

T-tubules

Front

What is the function of the sarcoplasmic reticulum in muscle cells?

Back

The sarcoplasmic reticulum stores and releases calcium ions, which are essential for muscle contraction.

Front

What is the I Band in a sarcomere?

Back

The I Band is the region of the sarcomere that contains only thin filaments (actin) and is lighter in color.