MEDICAL PHYSIOLOGY

Detailed explanation-1: -Each muscle is made up of groups of muscle fibers called fascicles surrounded by a connective tissue layer called perimysium. Multiple units of individual muscle fibers within each fascicle are surrounded by endomysium, a connective tissue sheath.

Detailed explanation-2: -Skeletal muscle fiber Sarcolemma-membrane surrounding the muscle fiber. Transverse tubules-portion of the sarcoplasmic reticulum that stores and releases calcium during contraction and relaxation. Myoneural junction-where motor nerve endings terminate on the sarcolemma. Sarcoplasm-cytoplasm of muscle fibers.

Detailed explanation-3: -Within a muscle fiber, proteins are organized into organelles called myofibrils that run the length of the cell and contain sarcomeres connected in series. Because myofibrils are only approximately 1.2 m in diameter, hundreds to thousands (each with thousands of sarcomeres) can be found inside one muscle fiber.

Detailed explanation-4: -Skeletal: As part of the musculoskeletal system, these muscles work with your bones, tendons and ligaments. Tendons attach skeletal muscles to bones all over your body. Cardiac: These muscles line the heart walls. Smooth: These muscles line the insides of organs such as the bladder, stomach and intestines. 29-Sept-2021