Pam is studying for a quiz on the muscular system. She writes in her notes that extrafusal muscle fibers
A) are found inside each muscle spindle.
B) are responsible for muscle contractions.
C) provide feedback regarding muscle contractions in the arms and legs.
D) are located at the junction between a muscle and tendon.

Question

Quizplus · Accepted Answer

Extrafusal muscle fibers are responsible for actual muscle contractions. They are the majority of muscle fibers in skeletal muscles and work together with intrafusal muscle fibers (found inside each muscle spindle) to control muscle tension and movement. They do not provide feedback or have a specific location at the junction between a muscle and tendon.

Pam Is Studying for a Quiz on the Muscular System