Muscles and their fronts Categories of musculus Smooth Skeletal or striated Cardiac Precise movements: few muscle fibers innervated by each axon Neuromuscular junction Acetylcholine Muscle contr exercise Antagonistic muscles Flexor Extensor Myasthenia gravis Autoimmune attack on acetylcholine receptors at neuromuscular junctions Progressive flunk and fast fatigue Depletion of acetylcholine after several(prenominal) action potentials in rapid succession Treatment Drugs that tame immune system Drugs that inhibit acetylcholinesterase (enzyme that breaks raft acetylcholine) Prolongs action of acetylcholine Fast and softened muscles Fish Red, slow, unsusceptible to fatigue Pink, intermediate speed, moderately skanky to fatigue White, fast, forceful, fatigue quickly Birds: discolour and twilit muscles Humans and other mammals: mixed fibers in each muscle Fast-twitch fibers Slow-twitch fibers Muscle escort by proprioceptors Stretch reflex Muscle spindle Stretch receptor parallel to muscle Causes muscle to contract: decreases stretch Golgi heftiness organ In tendons at opposite ends of muscle Inhibits muscle: bracken against too prompt contraction Location of be parts Units of movement Voluntary and in unpaid movements Reflexes: legitimate automatic responses to stimuli Inunpaid worker Many behaviors: mixture of voluntary and involuntary influences Movements with diametric esthesia to feedback Ballistic movement: executed as a whole; cannot be adapted after initiated High sensitivity to feedback Threading needle Singing Delayed auditive feedback Infant reflexes Grasp reflex Babinski reflex Rooting reflex Cerebral cortex damage in adults à infant reflexes released from inhibition Allied reflexes: several reflexes provoke to buzz offher Sequences of behaviors Central pattern generators Rhythmic movements Frequency of repetition: governed by spinal cord Motor plan: quick-frozen sequence of movements Learned or build in Birds: wing cite when dropped Humans: yawning Categories of movement Spinal labor neuron: final common path Many brain areas make different patterns Brain Mechanisms of Movement 1. The role of the cerebral cortex Primary ride cortex:... If you hope to get a full essay, point it on our website: Ordercustompaper.com
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