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PHYS 215 (11)
Lecture 9

PHYS 215 Lecture 9: Reflexes

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Ball State University
PHYS 215
Kelly Worden

1. Reflexes  Reflexes o Any response that occurs automatically without conscious effort o Simple or basic  Built in  Remove hand from hot stove  Spinal cord  Acquired or conditioned  Practice or learning o Reading music while playing o Brain  Reflex arc o Receptor  Responds to stimuli o Afferent pathway  Sends signal to integrating center  Integrating center o Processes information o Makes a decision o Efferent pathway  Instructions to muscle or gland o Effector  Muscle or gland carriers out response  Withdrawal reflex o Basic reflex  Pain receptor  Afferent to spinal cord  Message to activate neurons  Efferent to activate bicep muscles  Inhibit triceps muscles  Message of pain passed up to brain  Arm flexes and hand pulls away  Polysynaptic  Stretch reflex o Activation of stretch receptor o Afferent neuron terminates directly on an efferent o Efferent supplies muscle o Muscle contracts to counteract stretch o Monosynaptic  Other reflexes o Crossed extensor reflex  Ensures opposite limb will bear weight of body as injured limb is withdrawn  Receptor physiology o Photoreceptors – responds to light o Mechanoreceptors – responds to physical force  Touch, pressure, stretch, tension, or vibration o Nociceptors – responds to tissue damage o Proprioceptors – responds to change in position and movement o Chemoreceptors – responds to chemicals  Receptor potential o Receptor  End of neuron  Generator potential  Cell closely attached to a neuron  Receptor potential o No refractory period o Receptor potential is converted into an action potential  Adaption o Tonic receptors  Do not adapt or slowly adapt  Stretch receptors o Phasic receptors  Adapt quickly  Tactile receptors  Receptive field o Area monitored by a single neuron o Discrimination – ability to distinguish origin of stimuli  Fine – small receptive field  Poor – large receptive field o Lateral inhibition  Block weaker
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