Sensory Receptors

Sensory Receptors - Sensory Receptors sensory information -...

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Sensory Receptors sensory information - gets to central nervous system through 4 steps 4-step process o stimulation - activates sensory neuron o transduction - stimulus transformed into graded potentials o transmission - action potential lead to central nervous system o interpretation - brain analyzes/perceives senses from electrochemical messages 3 types of stimuli o mechanical forces - stimulate mechanoreceptors o chemicals - stimulate chemoreceptors o electromagnetic/thermal energy - stimulate photoreceptors free nerve endings - simplest sensory receptors, respond to mov’t of sensory neuron membrane, temperature change, chemicals in extracellular fluid exteroceptors - receptors receiving info from external environment o most developed in water for vertebrates interoceptors - receptors receiving info from within body o usually more simple than exteroceptors stimuli >> stimulus-gated ion channels open >> depolarization (receptor potential) >> info sent to brain
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Sensory Receptors - Sensory Receptors sensory information -...

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