Kinesiology 2230A/B Lecture Notes - Lecture 25: Neuromuscular Junction, Skeletal Muscle, Motor Neuron
19 Oct 2018
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Z lines: on either end of the sarcomere. These are anchor points for transfer of points when actin and myosin interact. Have centre point (m line) anchor point to transfer force throughout sarcomere to muscle itself. M line and interface with myosin- almost woven into the actin itself. Titian: gives muscle elastic properties, attached to z line and m line. Also sites for proteins involved in signalling cascades. Specific messenger rna bound to scaffolding proteins nervous system: Translated into action potentials in the brain. Have motor neurons innervating different muscles throughout the body leading to interface b/with actin and myosin. All organs also need innervations to perform functions. Vasoconstriction and dilation have direct stimulation to redistribute blood flow during exercise spinal cord: Brain initiates impulses for voluntary contraction down the sc. Have spinal nerves and peripheral motor nerve. Have pagential nerves innervating skeletal muscle going down motor neurons to muscle leading to contraction.
