PHYS 215 Lecture Notes - Lecture 9: Stretch Reflex, Reflex Arc, Stretch Receptor
21 Sep 2016
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Reflexes: any response that occurs automatically without conscious effort, simple or basic. Practice or learning: reading music while playing, brain. Integrating center: processes information, makes a decision, efferent pathway. Instructions to muscle or gland: effector. Message of pain passed up to brain. Stretch reflex: activation of stretch receptor, afferent neuron terminates directly on an efferent, efferent supplies muscle, muscle contracts to counteract stretch, monosynaptic. Ensures opposite limb will bear weight of body as injured limb is withdrawn. Receptor physiology: photoreceptors responds to light, mechanoreceptors responds to physical force. Touch, pressure, stretch, tension, or vibration: nociceptors responds to tissue damage, proprioceptors responds to change in position and movement, chemoreceptors responds to chemicals. Receptor potential: no refractory period, receptor potential is converted into an action potential. Receptive field: area monitored by a single neuron, discrimination ability to distinguish origin of stimuli. Poor large receptive field: lateral inhibition.
