Muscle Fiber Structure and Function Flashcards

Front

Actin

Back

A protein that forms thin filaments in muscle fibers, essential for muscle contraction.

Front

Myosin

Back

A motor protein that interacts with actin to cause muscle contraction, forming thick filaments.

Front

Sarcoplasmic Reticulum

Back

A specialized type of smooth endoplasmic reticulum in muscle cells that stores and releases calcium ions.

Front

A Band

Back

The dark band in a muscle sarcomere that contains the entire length of the thick filaments.

Front

I Band

Back

The light band in a muscle sarcomere that contains only thin filaments.

Front

Z Line

Back

The boundary of a muscle sarcomere, where actin filaments are anchored.

Front

Sarcomere

Back

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