EHS 385 Lecture Notes - Lecture 8: Neurotransmitter, Muscle Spindle, Intrafusal Muscle Fiber
18 Dec 2017
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Chapter 7 lecture 8 oc nervous system i. Assimilation of experiences necessary for memory and learning. Central nervous system (cns: brain and spinal cord. Peripheral nervous system (pns: neurons outside cns, sensory division. Afferent fibers transmit impulses from receptors to cns, afferent approaches. Efferent fibers transmit impulses from cns to effector organs, efferent exits. Axon: carries electrical impulse away from cell body, may be covered by schwann cells. Synapse: contact points between axon of one neuron and dendrite of another neuron. Neurological disease that destroys myelin sheaths of axons: has genetic component, due to immune attack on myelin. Results in progressive loss of nervous system function: fatigue, muscle weakness, poor motor control, loss of balance, mental depression. Exercise can improve functional capacity: leads to improved quality of life. Irritability: ability to respond to stimulus and convert it to neural impulse. Negative charge inside cells at rest: -5 to -100 mv, -40 to -75 mv in neurons.
