1. Myosin in the sarcomere is responsible for providing the ATP
2. Sarcomeres shortens when a muscle fiber contracts
3. Myosin is the protein of the skeletal muscle involving ATPase
4. Fasciculus, muscle fiber, myofibril, myofilament, actin-myosin is the descending order of size of muscle constituents
5. Fascicle is a group of skeletal muscle fibers
Explanation:
The head of myosin filaments in sarcomeres can bind with ATP and hydrolyze it to provide energy for sliding of filaments during muscle contraction.
The sarcomeres (the I band) of the muscle cells shorten during muscle contraction; while the actin and myosin filaments slide against each other to shorten the sarcomere
Myosin is a motor protein present in skeletal muscles that hydrolyzes ATP with the enzyme ATPase at its head.
Fasiculus is a bundle of muscle fibers. Each muscle fiber is made up of myofibrils with myofilaments called actin and myosin.
Fascicle refers to a group of skeletal muscle fibers bundled together and covered by connective tissues. These are bundled according to the type of movements they are involved.
