Organs

?General properties of sense organs ?sense organs figure some(prenominal) aspects of a rousing ?1. Modality ?all sense organs detect a specific form of free energy of the arousal ?A. light (photo sensory(prenominal) receptors) ?B. chemical (chemoreceptors) ? hold (gustation) ?smell (olfaction) ?C. mechanical energy (mechanoreceptors) ?touch and pressure ?muscle stretch ?auditive and sense of equilibrium receptors ?baroreceptors ?D. thermal energy (thermoreceptors) ?hot and cold ?also electro-receptors & magneto-receptors collapse in certain animals but not humans 2. transport amplitude of stimulation is coded by the frequency of action authorisations (APs) (Weber Fechner law) viosterol AP frequency (Hz) 0 stimulus intensity (log scale) 3. Location -location of stimulus is sight by the loose field of the sensational(prenominal) neuron -the vault of heaven 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 sensory neuron 1 sensory neuron 2 (SN1) (SN2) 4.

Sense organs obligate the property of transduction ? operator that the energy of stimulus is altered to galvanizing energy ?energy of stimulus is usually increased (amplified) or reduced during transduction stimulus Sensory receptor electromotive force -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 i! nflux, comonly via transient receptor potential channels (TRP) ?sensory potential may decline if stimulus is prolonged (called sensory edition) ?sensory receptors vary in point in time of adaptation ? smart receptors are non or slowly adapting ?phasic receptors are speedily adapting Sensory adaptation ?sensory receptors vary in score of adaptation ?tonic receptors are non or slowly adapting ?phasic receptors are...If you want to get a full essay, order it on our website: OrderCustomPaper.com

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