chemoreceptor
Quick Summary
Chemoreception is the process by which organisms detect and respond to chemical stimuli in their environment, primarily through the senses of taste and smell. This process involves chemicals acting as signals to regulate cell function without necessarily being absorbed by the cell for metabolism.1
Chemoreceptors are specialized sensory organs, such as taste buds, that react to chemical stimuli. In many invertebrates, these receptors are found in structures called sensilla, which are located on the exterior of the body. These sensilla contain receptor cells protected by accessory cells that produce a fluid to keep nerve endings from drying out and maintain a stable ionic environment for nerve cell function.23
In humans, chemoreceptors play a crucial role in controlling breathing by monitoring changes in blood oxygen and carbon dioxide levels. Specialized chemoreceptors in the carotid and aortic bodies detect these changes, signaling the brainstem to adjust breathing patterns accordingly.4
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chemoreceptionSignal transductionIn the case of chemoreceptors, these electrical changes are induced by chemicals. The initial changes are called receptor potentials, and they are produced by the movement of positively charged ions (e.g., sodium ions) into the cell through openings in the cell membrane called ion channels. Thus, in order to…
Read MoreIn the case of chemoreceptors, these electrical changes are induced by chemicals. The initial changes are called receptor potentials, and they are produced by the movement of positively charged ions (e.g., sodium ions) into the cell through openings in the cell membrane called ion channels. Thus, in order to…
Read More- chemoreceptionSpecialized chemosensory structures
Many invertebrates have chemoreceptor cells contained in discrete structures called sensilla that are located on the outside of the body. Each sensillum consists of one or a small number of receptor cells together with accessory cells derived from the epidermis. These accessory cells produce a fluid (analogous to…
Read MoreMany invertebrates have chemoreceptor cells contained in discrete structures called sensilla that are located on the outside of the body. Each sensillum consists of one or a small number of receptor cells together with accessory cells derived from the epidermis. These accessory cells produce a fluid (analogous to…
Read More - chemoreceptionSpecialized chemosensory structures
…other animals, much of their chemoreceptor capability depends on having appropriate receptor proteins in the receptor cells. In C. elegans there may be more than 700 genes controlling receptor protein production. However, because the number of receptor cells is limited, some of the cells must express more than one type…
Read More…other animals, much of their chemoreceptor capability depends on having appropriate receptor proteins in the receptor cells. In C. elegans there may be more than 700 genes controlling receptor protein production. However, because the number of receptor cells is limited, some of the cells must express more than one type…
Read More - chemoreceptionFish
…the taste buds, isolated (solitary) chemoreceptor cells are scattered over the surface of fish. These cells have a similar structure to that of individual taste receptor cells, but their connections to the brain or spinal cord arise from the nerves’ providing innervation for the particular part of the body in…
Read More…the taste buds, isolated (solitary) chemoreceptor cells are scattered over the surface of fish. These cells have a similar structure to that of individual taste receptor cells, but their connections to the brain or spinal cord arise from the nerves’ providing innervation for the particular part of the body in…
Read More - chemoreceptionTerrestrial vertebrates
This indicates that the chemoreceptor system of amphibians reflects their evolutionary position as terrestrial animals that are still dependent on an aquatic environment for breeding. The olfactory system is directly associated with the intake of air during breathing and thus is almost continuously exposed to environmental odors. In addition,…
Read MoreThis indicates that the chemoreceptor system of amphibians reflects their evolutionary position as terrestrial animals that are still dependent on an aquatic environment for breeding. The olfactory system is directly associated with the intake of air during breathing and thus is almost continuously exposed to environmental odors. In addition,…
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animalThe sensesChemoreceptors are usually little-modified sensory neurons, except for the taste receptors of vertebrates, which are frequently replaced cells in synaptic contact with permanent sensory neurons. Chemoreception is based on the recognition of molecules at receptor sites, lipid-protein complexes that are liberally scattered on the dendrites…
Read MoreChemoreceptors are usually little-modified sensory neurons, except for the taste receptors of vertebrates, which are frequently replaced cells in synaptic contact with permanent sensory neurons. Chemoreception is based on the recognition of molecules at receptor sites, lipid-protein complexes that are liberally scattered on the dendrites…
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human nervous systemReflex pathways…that trigger reflex responses are chemoreceptors found in the major arteries near the heart in groups close to the high-pressure mechanoreceptors. Functioning as oxygen sensors, these receptors are innervated by separate sets of fibers that travel parallel with the baroreceptor nerves, and they also project to the nucleus of the…
Read More…that trigger reflex responses are chemoreceptors found in the major arteries near the heart in groups close to the high-pressure mechanoreceptors. Functioning as oxygen sensors, these receptors are innervated by separate sets of fibers that travel parallel with the baroreceptor nerves, and they also project to the nucleus of the…
Read More- human nervous systemReceptors
Chemical receptors, or chemoreceptors, are sensitive to substances taken into the mouth (taste or gustatory receptors), inhaled through the nose (smell or olfactory receptors), or found in the body itself (detectors of glucose or of acid-base balance in the blood). Receptors of the skin are classified as thermoreceptors,…
Read MoreChemical receptors, or chemoreceptors, are sensitive to substances taken into the mouth (taste or gustatory receptors), inhaled through the nose (smell or olfactory receptors), or found in the body itself (detectors of glucose or of acid-base balance in the blood). Receptors of the skin are classified as thermoreceptors,…
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