A muscle fiber from the latissimus dorsi (one of the back muscles) of a chimpanzee has a lot of mitochondria and myoglobin and can generate relatively little force. Which type of muscle fiber is being described?

Question

Quizplus · Accepted Answer

A muscle fiber with a lot of mitochondria and myoglobin is a slow-twitch fiber. Slow-twitch fibers are fatigue-resistant and generate small amounts of force, making them well-suited for endurance activities. The fact that the fiber is from the latissimus dorsi muscle, which is involved in prolonged back movements, further supports the idea that it is a slow-twitch fiber.

A Muscle Fiber from the Latissimus Dorsi (One of the Back