GENERAL HISTOLOGY

Detailed explanation-1: -The correct answer: During muscle contraction, myosin cross-bridges attach to B) actin filaments. Muscle contraction is a process in which the interaction between the muscle filaments takes place. The actin and myosin filaments interact with the help of the sliding movement of actin which occurs on myosin.

Detailed explanation-2: -The cross-bridge cycling demonstrates the shortening of muscles due to the movement of the contractile proteins. The cross-bridge muscle contraction cycle is recognized in all types of muscles, such as cardiac, smooth, and skeletal muscles. This means that all muscle types contract by cross-bridge cycling.

Detailed explanation-3: -As discussed later, the motor activity of myosin moves its head groups along the actin filament in the direction of the plus end. This movement slides the actin filaments from both sides of the sarcomere toward the M line, shortening the sarcomere and resulting in muscle contraction.