What type of muscle contraction occurs when someone lifts a book off a desk?
A) Isometric
B) Twitch
C) Isotonic
D) Both A and B

Question

Quizplus · Accepted Answer

When someone lifts a book off a desk, the muscle fibers are shortening while producing tension, resulting in movement of the book. This is an example of isotonic contraction. Isometric contraction occurs when the tension is produced in the muscle fibers without causing movement, such as when holding a heavy object steady. Twitch is a rapid and brief muscle contraction that occurs in response to a single stimulus.

What Type of Muscle Contraction Occurs When Someone Lifts a Book