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A myofibril is made up of numerous (up to 10,000) small contractile units called _________ that are laid end to end.
This refers to the region that spans two Z-lines and is about 1.5-2 um long in a resting muscle.
Sacromeres
arranged along both sides of actin filament which plays a role in the regulation of contraction
Troponin-tropomyosin complexes
In electron microscope: sarcomere consists a collection of thread-like structures called
Myofilaments
This theory states that when a muscle contracts, it shortens because the interaction of the actin and myosin molecules causes the thin and thick filaments to slide past each other, resulting in the shortening of the sacromeres.
Sliding filament theory
refers to a long, tapering, cylindrical and multinucleated cells
Skeletal muscle cells
Short head - Apex of the Coracoid process of the scapula
Long head - Supraglenoid tubercle of the scapula
What is the Mnemonic of this origin?
: 'You walk Shorter to a street Corner. You ride Longer on a Superhighway’
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