Biology, 01.08.2019 06:30 baidentheodore617

Match the stimulus example to the type of sensory receptor. 1. chemoreceptor 2. photoreceptor 3. mechanoreceptor 4. nociceptor 5. thermoreceptor

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Sensory receptors are dendrites of sensory neurons specialized for receiving kinds of stimuli.
i) Chemoreceptors are sensory receptors that detects the presence of chemicals; responsible for taste, smell, and monitoring the concentration of certain chemicals in body fluids. They are essential to the maintenance of homeostasis as they constantly monitor minute changes in the relative concentrations of both lipid and water soluble compounds dissolved in the fluids that surround them.

ii) Photoreceptor are sensory receptors that detects light; located in the retina of the eye. They have great biological importance in converting light which is visible electromagnetic radiation into signals that can stimulate biological process. A process called visual phototransduction.

iii) Mechanoreceptors are sensory receptors that respond to a bending or deformation of the cell; For example receptors for touch, pressure, hearing and equilibrium. The mechanical deformation transmitted by the receptors include, joint rotation due to position change and motion, into electrical signals.

iv) Nociceptor is a sensory receptor that responds to tissue damage , pain receptors. This type of receptor at the end of sensory neuron's axon that responds to damaging or potentially damaging stimuli by sending possible threat signals to the spinal cord and the brain (central nervous system).

v) Thermoreceptor is a sensory neuron that detects changes in temperatures. It is a non-specialized sense receptor, or the receptive portion of a sensory neuron, that codes absolute relative changes in temperature, primarily within the innocuous range.

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they may bind directly to special “promoter” regions of dna, which lie upstream of the coding region in a gene, or directly to the rna polymerase molecule.

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a fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.[1] the age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.[2] fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas.[3] other commonly used derivatives include kerosene and propane. fossil fuels range from volatile materials with low carbon to hydrogen ratios like methane, to liquids like petroleum, to nonvolatile materials composed of almost pure carbon, like anthracite coal. methane can be found in hydrocarbon fields either alone, associated with oil, or in the form of methane clathrates.

the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]