Muscle fibers quiz

Muscle fiber

What is a muscle cell called

Sarcolemma

The plasma membrane of muscle fibers

Myofibrils

Long fibers alternating dark and light bands

I bands (light bands)

Location of thin filaments (actin) in sarcomere

Dark band (A band)

Location of thick fillaments (myosin)

Sarcomeres

Connective units of a muscle

Myofilaments

Threadlike proteins within the muscle fiber, 2 types: actin and myosin

Actin

Thin filament in light bands

Myosin

Bundled thick bands, projects myosin heads

Cross bridge

Link between the myosin heads and actin meat

Sarcoplasmic reticulum

Fiber cell organelle,stores calcium and releases ir