What are chemoreceptors

Definition:


The receptors which respond to change in chemicals are known as chemo-receptors.

Explanation:


Chemo-reception acts specially to stimulate a response. Chemo-reception is a direct sense in those molecules. Chemo-reception is the oldest and most universal sense in  animal kingdom specially.

Protozoa:


They have a chemical sense. They respond with refraining behavior. They stay away from acid, alkali and salt stimuli. Particular chemicals draw predatory ciliates to their prey.

Aquatic invertebrates:


The chemo-receptors of many aquatic invertebrates are present in pits or depressions. Water with specific chemicals can circulate through it.

Arthropods:


In arthropods the chemo-receptors are present on antennae. In arthropods they are also present in mouth parts and legs. They are also present in the form of hollow hairs in them. These hairs are termed as sensilla. Sensilla contains chemo-sensory neurons.

The nature of chemical receptors is linked to their lifestyle. Some animals are use to perform tasks , such as humidity detection, pH assessment, prey tracking, food recognition and mate locating i.e. male or female. So their chemo-receptors detect these chemicals. For example; female silk moth secretes bombyol as sex attractant. The male silk moth detect bombyol in one trillion molecules. Its receptors are present on the antennae. A male moth can find a female moth several miles downwind at night.

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