HSCI 100 Lecture Notes - Lecture 8: Endoplasmic Reticulum, Skeletal Muscle, Myocyte
19 Oct 2015
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Document Summary
Both systems are involved with movement that allows us to respond to stimuli, digestion of food, return of blood to the heart and moving air in and out of the lungs. Both systems keep us upright and protect body parts. Bones store and release calcium, which is needed for muscle contraction, blood clotting and nerve impulse conduction. Muscles help maintain a constant body temperature. Smooth- involuntary muscle found around hollow organs and blood vessels, gi tract. has spindle shaped, nonstriated, uninucleated fibbers. Cardiac- involuntary muscle found in the heart. has striated, branched, generally uninucleated fibers. occurs in walls of heart. Skeletal- voluntary muscle that is attached to the skeleton. has striated, tubular, multinucleate fibbers. * a ligament is a bone to bone connector* Fascicles are bundles of muscle fibers, which are in turn bundles of myofibrils. Myofibrils are a bundle of myofilaments that run the length of a fiber.
