Final answer:
Muscles make up about 40% of an individual's total body weight. Sprinters are likely to have a higher percentage of fast-twitch muscle fibers at 80%, while marathon runners are likely to have a higher percentage of slow-twitch muscle fibers at 80%. An average adult male has about 42% skeletal muscles, whereas an average adult female has about 36% skeletal muscles.
Step-by-step explanation:
Muscles, constituting about 40% of the total body weight, are characterized as red flesh or lean meat. Therefore, the correct answer to this question is d) 40%.
The muscles of a professional sprinter are most likely to have 80 percent fast-twitch muscle fibers and 20 percent slow-twitch muscle fibers, which is option a. This is because fast-twitch fibers are more suitable for short bursts of strength or speed, which is what sprinting requires.
Contrastingly, the muscles of a professional marathon runner are likely to have 20 percent fast-twitch muscle fibers and 80 percent slow-twitch muscle fibers, which is option b. Slow-twitch fibers are better for endurance and long-duration activities like marathon running.
Skeletal muscle or voluntary muscle is anchored by tendons to the bone and is used to affect skeletal movement such as locomotion and in maintaining posture. An average adult male is made up of 40-50% skeletal muscle, and an average adult female is made up of 30-40% of skeletal muscle, as a percentage of body mass.