Intrafusal muscle fibers are big or small?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Enhance your knowledge of the Lower Motor Apparatus with our Test. Prepare with our comprehensive study materials, including flashcards and multiple-choice questions, each accompanied by detailed explanations and hints. Boost your readiness for the exam!

Multiple Choice

Intrafusal muscle fibers are big or small?

Explanation:
Intrafusal muscle fibers are the small, specialized fibers inside a muscle spindle that detect stretch. They sit in parallel with the larger extrafusal fibers and remain small because their main job is sensory—providing information about muscle length and how quickly it’s changing. The spindle contains different intrafusal fiber types (like nuclear bag and nuclear chain fibers), and their ends are controlled by gamma motor neurons to adjust sensitivity, while the central region transmits the sensory signal to the nervous system. By contrast, the big extrafusal fibers are the force-producing workhorses. So intrafusal fibers are small.

Intrafusal muscle fibers are the small, specialized fibers inside a muscle spindle that detect stretch. They sit in parallel with the larger extrafusal fibers and remain small because their main job is sensory—providing information about muscle length and how quickly it’s changing. The spindle contains different intrafusal fiber types (like nuclear bag and nuclear chain fibers), and their ends are controlled by gamma motor neurons to adjust sensitivity, while the central region transmits the sensory signal to the nervous system. By contrast, the big extrafusal fibers are the force-producing workhorses. So intrafusal fibers are small.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy