Gusto y olfato 2011
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GUSTO Y OLFATO
Los Sentidos Químicos
Clik para avanzar
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• Receptores: quimioreceptores.
• Los receptores del olfato son telereceptores.
• Sentidos viscerales: relacionados con funciones gastrointestinales.
Diferencias:
• Las vías olfatorias no relevan en el tálamo.
• No existe área de proyección neocortical para el olfato.
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ESTIMULO: Sustancias sápias Solubles en agua
DEFINICIÓN:Sentido especial que permite captar la naturaleza de las sustancias químicas disueltas en la boca.
SABORTEXTURATEMPERATURAOLORDOLOR
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RECEPTORES:
CELULAS CILIADAS GUSTATIVAS
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DISTRIBUCIÓN DE LAS PAPILAS GUSTATIVAS
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TRANSDUCCIÓN EN LOS DISTINTOS SABORES.
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SALADO
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ÁCIDO
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DULCE
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AMARGO
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VIAS GUSTATIVAS
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REFLEJOS: Salivación
ADAPTACIÓN:
Casi completa al cabo de un minuto de estimulación continua.
Se produce en el SNC.
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DEFINICIÓN:Sentido especial que permite detectar e identificar
sustancias químicas transportadas por el aire
ESTÍMULO:
• VOLATIL
• HIDROSOLUBLE
• LIPOSOLUBLE
• MOLÉCULAS PEQUEÑAS
Sustancia odoríferas
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Células olfatoria: cél. Nerviosas bipolares (neuronas modificadas)
Ubicadas en la membrana amarilla
RECEPTORES:
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TRANSDUCCIÓN:
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Mecanismo del AMPc
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Mecanismo del IP3
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Vías olfatorias
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Lamerse los labios, salivación Estornudos Lagrimeos Inhibición respiratoria. Olfateo.
REFLEJOS:
ADAPTACIÓN:50% en el primer segundo.En el SNC.