chemoreceptors


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chemoreceptors

Nerve endings stimulated to produce nerve impulses by contact with chemical substances or as a result of changes in the local concentration of chemical substances. The receptors for smell and taste, those for oxygen in the carotid bodies and those for glucose in the pancreas are of this type.

chemoreceptors

neural receptors that respond to some local chemical change. Usually refers to those which influence the respiratory and cardiovascular control centres in the brain stem: the medullary chemoreceptors, sensitive to pH changes in the cerebral extracellular fluid, and the arterial chemoreceptors which continually sense and respond to changes mainly in blood oxygen, carbon dioxide and pH, leading to appropriate reflex adjustments via afferent nerves to the brain stem control centres (e.g. increase in ventilation if arterial oxygen tension tends to fall and/or carbon dioxide to rise). See also breathing, hypoxia.

chemoreceptors

cells, or groups of cell membrane molecules, which initiate nerve action potentials
References in periodicals archive ?
The peripheral chemoreceptors only respond to partial pressure of gas and not to gas content.
Thus, antennular chemoreceptors make possible the detection of low-molecular weight stimuli, such as olfactory sex pheromones or food attractants, at some distance from the source of the odor stimulus.
Current results indicated to the presence of pores on sensilla and presence or absence of pores in the structure of sensilla affect on the functions of antennae in ant, whereas it was reported that nonporous sensilla trichodea are mechanoreceptors while those with pores are contact and volatile chemoreceptors [8].
But this would require that the term "olfaction" be defined as the sensing of specific chemicals in the animal's external environment (airborne or aqueous) via chemoreceptors either localized or dispersed over the animal's body surface.
These cells act as chemoreceptors, and they secrete catecholamines.
Antennae are the major site of the chemoreceptors that detect and discriminate between air-borne stimuli and guide the mosquitoes to suitable human host or to an oviposition site.
Because carrion is a scarce and ephemeral resource in nature, the beetles must traverse large areas in search of it, aided by antennae that contain chemoreceptors (chemical sensors).
Each tentacle has two rows of suction cups that have chemoreceptors that enable the octopos to "taste" the difference between sweet, sour and bitter.
2] as compared both in healthy subjects than in heart failure patients; this could be mediated by chemoreceptor control mechanism, as in heart failure patients, and also by non-chemoreceptor control mechanisms; indeed hypoxemia is usually lower than normally required for significant stimulation of hypoxic chemoreceptors.
Lobeline, a piperidine alkaloid, which is produced by Lobelia inflata (family Lobeliaceae) and several other Lobelia species, stimulates chemoreceptors in carotid and aortic bodies, and then exerts reflectory activation of respiratory centre (Fig.
2] in blood arriving at central chemoreceptors and continuing during subsequent rest.