Comment les odeurs alors ?

mais oui, ce doit être ça.

Très mystérieux. Surtout quand on se souvient que certains papillons sont capables de sentir des phéromones sexuelles à plus d'un km du partenaire.

Alors dois-je comprendre que ces mêmes papillons, avant de sentir leur copine de loin, filtrent avant le poisson qu'est à 20 m, mes pieds à 200 m etc ?
Sentons-nous juste certaines particules [PAS DE BLAGUE ;-)] ? Un peu comment nous n'entendons que certaines longueurs d'onde ?

Mais oui, de même que nous ne voyons aussi que certaines longueurs d'onde.

Il est possible aussi que le papillon ne sente ni le poisson, ni tes pieds, mais soit spécialisé dans une odeur particulière.

Mais les ... particules ... nous pénètrent ?
Je veux dire : si je sens une épouvantable odeur de merde en marchant sur un trottoir, suis-je en train d'ingérer de cette merde ?

Peut-être en effet qu'on sélectionne les odeurs qu'on apparente à une image, un souvenir etc.
A mon avis, les particules restent figées dans le mucus de ton nez lysp. Et ensuite il doit y avoir une chaîne de neurotransmetteurs qui se chargent du reste, non ? je sais rien, jvais fouiner dans mes sciences et vie ;o)

Il nous faut des spécialistes, des scientifiques !
A l'aiiiiiiide !

Google is my friend :

Les particules odorantes sont des éléments extrêmement fins qui pénètrent plus facilement dans le sang que les produits alimentaires, du fait des barrières d'échange ténues que constituent le système alvéoles / capillaires pulmonaires.


L'odeur n'est pas une mystérieuse radiation : elle naît lorsqu'un peu de la substance des choses, portée par les courants aériens, rencontre quelques-unes des 50 millions de cellules qui forment notre appareil olfactif dans les profondeurs des fosses nasales.

La cellule réceptrice est un neurone un peu particulier, l'axone. Très exposé aux vapeurs toxiques ainsi qu'aux microbes, il jouit d'un statut spécial, celui d'être remplacé quand il est détruit.

L'information recueillie dans la membrane des cils du nez transite ensuite le long de l'axone, sorte de fin prolongement du neurone, jusqu'au bulbe olfactif qui l'accueille à l'entrée du cerveau. Pour éviter le mélange et la confusion résultant de l'arrivée simultanée d'informations collectées par les millions d'axones qui composent le nerf olfactif, le circuit nerveux interne instaure une "carte de regroupement d'axones "réagissant à des messages de même nature. Ainsi organisée, l'information est décodée par le cerveau et l'odeur associée au message se trouve identifiée. Les neurophysiologistes parviennent ainsi à obtenir une " image" de certaines odeurs.
----

Conclusion : oui, quand tu respires de la merde, tu en inhales.

> brio : Voilà un surnom amplement mérité, brio !
Il reste juste une chose à préciser à l'occasion, comment les "particules odorantes" sont-elles diffusées ? Ce serait chouette si on pouvait maîtriser ça pour envoyer à tel ... ou telle, un bouquet charmant ... ou un clair rejet ! ;-)
Mais peut-être le faisons-nous déjà sans le savoir...

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