MICROANATOMY

Detailed explanation-1: -The correct sequence, from smaller unit to larger unit in a muscle is A Muscle, Fascicles, Muscle cell, Myofibrils, Myofilaments B Myofibrils, Myofilaments, Muscle fibre, Fascicles, Muscles C Myofilaments, Myofibrils, Muscle fibre, Muscle fascicle, Muscle D Myofibrils, Muscle fibre, Myofilament, fascicles, Muscles.

Detailed explanation-2: -Based on the dimensions, the above-mentioned structures can be arranged in the following way from the largest to the smallest component: Muscle fiber → Myofibril → Sarcomere → Thin-filaments →Troponin.

Detailed explanation-3: -Sarcomeres are the smallest functional units of muscle fiber. If we go from outside to inside, the correct muscle order would be epimysium, perimysium, fascicle, endomysium, muscle fibers, sarcolemma, myofibrils, and sarcomeres.

Detailed explanation-4: -Answer: A-The correct order of structures of a muscle from smallest to largest is: muscle fiber, endomysium, fascicles, perimysium, epimysium.

Detailed explanation-5: -Myofibrils are composed of smaller structures called myofilaments. There are two main types of filaments: thick filaments and thin filaments; each has different compositions and locations.