ANATOMY

Detailed explanation-1: -Myosin. Thick myofilaments are comprised of around 300 spirally arranged protein molecules called myosin. Each myosin molecule is composed of two heavy chains and four light chains.

Detailed explanation-2: -Thick filaments are composed of dimers of a remarkable force-generating protein called myosin. Allmyosin molecules have helical tails and globular head groups that hydrolyze ATP and act as motors to move along an actin filament.

Detailed explanation-3: -Each sarcomere is composed of protein filaments (myofilaments) that include mainly the thick filaments called myosin, and thin filaments called actin. The bundles of myofilaments are called myofibrils.

Detailed explanation-4: -There are two main types of myofilaments: thick filaments and thin filaments. Thick filaments are composed primarily of myosin proteins, the tails of which bind together leaving the heads exposed to the interlaced thin filaments. Thin filaments are composed of actin, tropomyosin, and troponin.

Detailed explanation-5: -The fundamental functional unit of muscle is called a sarcomere. One muscle may contain as many as 100, 000 of the repeating sarcomere units. In the sarcomere, the myofilaments (thick filaments and thin filaments) are organized into parallel units.