MEDICAL PHYSIOLOGY

Detailed explanation-1: -Endurance exercise causes an increase in cellular mitochondria, myoglobin, and capillary networks in slow twitch fibers. Endurance athletes have a high level of slow twitch fibers relative to the other fiber types. Resistance exercise causes hypertrophy.

Detailed explanation-2: -Type I, or slow-twitch fibers, are seen in high abundance in elite endurance athletes, such as long-distance runners and cyclists. Alternatively, fast-twitch IIa and IIx fibers are abundant in elite power athletes, such as weightlifters and sprinters.

Detailed explanation-3: -The two types of skeletal muscle fibers are slow-twitch (type I) and fast-twitch (type II). Slow-twitch muscle fibers support long distance endurance activities like marathon running, while fast-twitch muscle fibers support quick, powerful movements such as sprinting or weightlifting.

Detailed explanation-4: -Why do endurance athletes, such as marathon runners, have a higher proportion of slow fibres in their muscles, compared to fast fibres? It is more beneficial to endurance athletes to have slow-twitch fibres because they have a greater resistance to fatigue.

Detailed explanation-5: -Which muscle-fiber type is best suited for endurance activities, such as long-distance jogging? Slow oxidative fibers are best suited for endurance activities because they produce ATP aerobically and are fatigue-resistant. Innervation of several motor units of a muscle.