BGYB30H3 Lecture 11 Notes Sensory 2-Oct 15

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Biological Sciences
Ingrid L.Stefanovic

BGYB30H3 Lecture 11 Notes -special senses are conscious and cause voluntary responses (vision, taste, hearing, smell, and equilibrium) -somatic senses can either be conscious or unconscious senses causing a response (pain, touch, proprioception, blood pH, blood pressure, temperature) -blood pH and pressure are unconscious senses -sensory systems are activated by physical and sometimes chemical energy -changes in membrane potential are known as generatorreceptor potentials, which are the same as graded potentials -integration of a signal in the CNS is through somatosensory cortex (conscious) or spinal cord (unconscious) -simple receptor neuron has free nerve endings that come in contact with stimulus (can be myelinated or unmyelinated) -complex receptor neuron has connective tissue that covers nerve endings and are always myelinated -special senses receptor neuron have a receptor cell that synapses onto the sensory neuron and are always myelinated -stimulus hits receptor cell which releases neurotransmitters onto sensory neuron -chemical stimuli such as taste, smell, oxygen and glucose activate chemoreceptors -mechanical stimulus such as pressure (baroreceptors), vibration (osmoreceptors) and accelerationgravity (proprioception) and sound activate mechanoreceptors -nocioreceptors respond to pain stimuli -an adequate stimulus is the form of energy to which that receptor
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