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rabies
Infectious disease of the central nervous system caused by a virus from the family Rhabdoviridae; classified as an RNA virus because its genetic material is composed of ribonucleic acid (RNA).
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radiation therapy
The use of high energy rays (e.g. x-rays, gamma rays) administered externally or radioactive substances (e.g. cesium, iridium, iodine) administered internally to destroy cancer cells; often used in conjunction with chemotherapy and/or surgery.
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radio waves
Electromagnetic waves of relatively low frequency.
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radiofrequency (RF) pulses
A pulse of radio waves at the Larmor frequency used to change the orientation of hydrogen protons; used during MRI scans.
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radiography
The use of x-rays to obtain images of internal body structures.
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reflex
An involuntary response to a stimulus.
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reflex arc
The simplest pathway of central nervous system control, involving a sensory neuron, motor neuron, and usually an interneuron.
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retina
Light-sensitive neuronal layer lining the back of the eye that sends impulses through the optic nerve that are translated into a visual image; part of the central nervous system. ►click here to learn more-link provided by: www.peteducation.com
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retrobulbar
Behind the globe of the eye.
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retrovirus
A virus that makes a DNA copy from its RNA and inserts it into an infected cell's DNA; an RNA virus from the family Retroviridae. Retroviruses are species specific and are fragile, being easily inactivated by ultraviolet light, heat, detergents, and drying. They can cause many diseases, including some cancers and AIDS.
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rickettsia
A parasitic bacteria occurring in the lumen of the gut in lice, fleas, ticks, and mites, by which they are transmitted to animals.
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rostral
Toward the head or nose.
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