Question

fill in the blank question muscle fibers that have an abundant blood supply, many myoglobin molecules and mitochondria, and are adapted for exercises like walking, jogging and biking, are known as twitch fibers.

Explanation:

These characteristics describe slow - twitch muscle fibers. They are aerobic, fatigue - resistant and well - suited for endurance activities like walking, jogging and biking due to their high myoglobin content (which stores oxygen), abundant mitochondria (for aerobic energy production) and good blood supply.

Answer:

slow