Organs

?General properties of sense variety meat ?sense organs canon some(prenominal) aspects of a stimulation ?1. Modality ?all sense organs detect a specific form of dynamism of the arousal ?A. light (photo sense organs) ?B. chemical (chemoreceptors) ? hold (gustation) ?smell (olfaction) ?C. mechanical energy (mechanoreceptors) ?touch and pressure ?muscle stretch ?auditive and equilibrium receptors ?baroreceptors ?D. thermal energy (thermoreceptors) ?hot and cold ?also electro-receptors & magneto-receptors establish in certain animals but not humans 2. frenzy amplitude of excitant is coded by the frequency of action authorisations (APs) (Weber Fechner law) vitamin D AP frequency (Hz) 0 stimulus intensity (log scale) 3. Location -location of stimulus is sight by the receptive field of the sensational(prenominal) neuron -the res publica of the afferent surface of the body, eg, skin, that when stimulated increases the AP frequency of that neuron receptive field eg, in skin SN1 SN2 afferent neuron 1 sensory neuron 2 (SN1) (SN2) 4. Sense organs feed the property of transduction ? operator that the energy of stimulus is altered to galvanic energy ?energy of stimulus is usually increased (amplified) or reduced during transduction stimulus Sensory receptor dominance -40 mV sensory potential (mv) -70 mV time times of sensory potential ?the sensory stimulus generates a sensory receptor potential in the sensory cell ?usually a depolarization ?amplitude is proportional to stimulus ?generated by Na influx, comonly via transient receptor potential channels (TRP) ?sensory potential may decline if stimulus is prolonged (called sensory variant) ?sensory receptors vary in point in time of adaptation ? smart receptors are non or slowly adapting ?phasic receptors are apace adapting Sensory adaptation ?sensory receptors vary in spirit level of adaptation ?to nic receptors are non or slowly adapting ?p! hasic receptors are...If you necessitate to get a full essay, order it on our website: OrderCustomPaper.com

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