MUSCLE PHYSIOLOGY

Detailed explanation-1: -Each compartment contains a bundle of muscle fibers. Each bundle of muscle fiber is called a fasciculus and is surrounded by a layer of connective tissue called the perimysium. Within the fasciculus, each individual muscle cell, called a muscle fiber, is surrounded by connective tissue called the endomysium.

Detailed explanation-2: -Myofibril vs Muscle Fiber Myofibril is a basic rod-like unit of a muscle fiber. Muscle Fiber is a tubular shaped cell of the muscle. Myofibril is composed of two types of myofilaments called thin and thick filaments. Muscle Fiber is composed of numerous myofibrils.

Detailed explanation-3: -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-4: -The three main types of muscle include skeletal, smooth and cardiac. The brain, nerves and skeletal muscles work together to cause movement – this is collectively known as the neuromuscular system.