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magnetoreceptor

A device or organ that detects magnetic fields, particularly the earth's magnetic field. Some form of magnetic sense is found in a wide range of animals, including insects, fishes, ...

magnetoreceptor

magnetoreceptor   Quick reference

A Dictionary of Biology (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
257 words

...magnetoreceptor A device or organ that detects magnetic fields, particularly the earth’s magnetic field. Some form of magnetic sense is found in a wide range of animals, including insects, fishes, amphibians, reptiles, birds, and mammals, but the nature of the magnetoreceptor organs remains elusive. Investigators have sought small particles of the magnetic material magnetite, which are postulated to transduce the magnetic field into nervous impulses. But the only confirmed examples of magnetite in organisms are found in magnetotactic bacteria, which use the...

magnetoreceptor

magnetoreceptor  

A device or organ that detects magnetic fields, particularly the earth's magnetic field. Some form of magnetic sense is found in a wide range of animals, including insects, fishes, amphibians, ...
magnetite

magnetite   Quick reference

A Dictionary of Biology (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
25 words

...magnetite A strongly magnetic mixed iron oxide, Fe 3 O 4 , postulated to be part of the magnetoreceptor in some birds and other...

navigation

navigation   Quick reference

A Dictionary of Biology (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
174 words

...For example, birds use the sun and stars as landmarks and are sensitive to the earth’s magnetic fields, as are many other animals; for example, turtles return decades later to the beach where they hatched by sensing the intensity and inclination of the magnetic field ( see magnetoreceptor ), while salmon can identify the unique odour of their home river. It is thought that homing pigeons might use very low-frequency sound (infrasound) to build up a topographic map of the area surrounding their loft, as well as a magnetic sense, to guide their flight back...

receptor

receptor   Quick reference

A Dictionary of Biology (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
185 words

...ears, nose, skin, and other sense organs all contain specific receptors responding to external stimuli ( see exteroceptor ); other receptors are sensitive to changes within the body ( see interoceptor ). See also baroreceptor ; chemoreceptor ; electroreceptor ; magnetoreceptor ; mechanoreceptor ; osmoreceptor ; proprioceptor ; thermoreceptor . 2. A protein that can bind with a specific ligand (i.e. a hormone, neurotransmitter, drug, or other chemical), thereby initiating a change within the cell. Some receptor proteins occur in the plasma...

electroreceptor

electroreceptor   Quick reference

A Dictionary of Biology (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
343 words

...The high sensitivity of these organs enables a shark, for example, to sense the very weak electric currents, perhaps just a few microamps, generated by the respiratory muscles of a resting plaice buried in the sand. Sharks and rays also use their ampullae of Lorenzini as magnetoreceptors to detect the earth’s magnetic field. Similar organs occur in certain teleost fish, for example the marine catfish Plotosus . Some fish generate their own weak electric field as an alarm system or as a means of locating objects or communicating with other individuals of...

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