9 & 10 muscles

• 3 layers of CT that bind muscle fibers together are: epimysium, perimysium, and endomysium (biggest to smallest)
• epimysium surrounds the ENTIRE muscle
• perimysium is between fascicles (bundles)
• endomysium is around individual muscle fibers
• endomysium is outside sarcolemma
• fascicle = bundle of muscle fibers
• sarcoplasmic reticulum looks like webbing and surrounds the sarcomere
• t-tubules = invagination of sarcolemma
• sarcolemma = cell membrane
• actin = thin filament
• myosin = thick filament
• the insertion is the more flexible end of the muscle that is attached to a movable bone
• tendons allow your body to move and give you flexibility while aponeuroses give your body strength and stability
• one T-tubule with two terminal cisternae on both sides of the tubule forms a triad
• a motor unit is a neuron that stimulates muscle cells to contract
• large motor units generate more force and are therefore fatigued easier while small motor units are beneficial in sustaining muscle contraction