1. بسم الله الرحمن الرحيم Comparison of different types of muscles Dr. ShaikhMujeeb Ahmed Assistant Professor Department Basic Medical Sciences Division of Physiology Faculty of Medicine Almaarefa Colleges

2. Spot the Difference

5. Metabolic Systems

6. Phosphocreatine-Creatine System • Quicker - 4 moles of ATP per min. • Maximum muscle power for 8-10 seconds. • Used mainly in 100 meter run.

7. Glycogen Lactic Acid System • Stored glycogen split into glucose & then glucose to energy. • Anaerobic metabolism • 2.5 times as rapid as oxidative mechanism. • Short to moderate period, 1.3 – 1.6 min of maximum muscle activity

8. Aerobic System • Oxidation of food stuff in mitochondria. • Moles of ATP per min are 1/min. • Maximum muscle power for as long as nutrients last. • Marathon run.

9. Major Types of Muscle Fibers • Classified based on differences in ATP hydrolysis and synthesis • 3 major types • Slow-oxidative (type I) fibers • Fast-oxidative (type IIa) fibers • Fast-glycolytic (type IIx) fibers

11. Percentage of fast twitch and slow twitch fibers in quadriceps muscle Fast Twitch Slow Twitch 82% 74% 45% 37% 37% • 18% • 26% • 55% • 63% • 63% • Marathoners • Swimmers • Weight lifters • Sprinters • Jumpers

12. References • Human physiology by Lauralee Sherwood, 7th edition • Text book physiology by Guyton &Hall,12th edition • Text book of physiology by Linda .s contanzo,third edition