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nervous excitation

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  • nervous system, human — ▪ anatomy Introduction       system that conducts stimuli from sensory receptors to the brain and spinal cord and that conducts impulses back to other parts of the body. As with other higher vertebrates, the human nervous system has two main… …   Universalium

  • nervous system — Anat., Zool. 1. the system of nerves and nerve centers in an animal or human, including the brain, spinal cord, nerves, and ganglia. 2. a particular part of this system. Cf. autonomic nervous system, central nervous system, peripheral nervous… …   Universalium

  • Nervous system — Nerve redirects here. For other uses, see Nerve (disambiguation). This article is about the nervous system. For parts of the nervous system commonly called nerves, see Peripheral nerve. Nervous system The Human N …   Wikipedia

  • excitation-contraction coupling — Name given to the chain of processes coupling excitation of a muscle by the arrival of a nervous impulse at the motor end plate to the contraction of the filaments of the sarcomere. The crucial link is the release of calcium from the sarcoplasmic …   Dictionary of molecular biology

  • venom — venomless, adj. /ven euhm/, n. 1. the poisonous fluid that some animals, as certain snakes and spiders, secrete and introduce into the bodies of their victims by biting, stinging, etc. 2. something resembling or suggesting poison in its effect;… …   Universalium

  • innervation — The supply of nerve fibers functionally connected with a part. [L. in, in, + nervus, nerve] reciprocal i. contraction in a muscle is accompanied by a loss of tone or by relaxation in the antagonistic muscle. SYN: reciprocal inhibition (1). * * *… …   Medical dictionary

  • Hoppe's definition of hallucinations —    In 1871 the Swiss physiologist Johann Ignaz Hoppe (1811 1891) defined hallucinations as follows: Visions and hallucinations are... not false interpretations of something on hand, but mere constructionsofsomething not on handfrom, and out of,… …   Dictionary of Hallucinations

  • sarcoplasmic reticulum — n the endoplasmic reticulum of cardiac muscle and skeletal striated muscle that functions esp. as a storage and release area for calcium * * * an arrangement of membranous vesicles and tubules found in the cytoplasm of striated muscle fibres. The …   Medical dictionary

  • sarcoplasmic reticulum — an arrangement of membranous vesicles and tubules found in the cytoplasm of striated muscle fibres. The sarcoplasmic reticulum plays an important role in the transmission of nervous excitation to the contractile parts of the fibres …   The new mediacal dictionary

  • radiation — radiational, adj. /ray dee ay sheuhn/, n. 1. Physics. a. the process in which energy is emitted as particles or waves. b. the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and… …   Universalium

  • cardiovascular disease — Introduction       any of the diseases, whether congenital or acquired, of the heart and blood vessels (blood vessel). Among the most important are atherosclerosis, rheumatic heart disease, and vascular inflammation. Cardiovascular diseases are a …   Universalium

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