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Science Vocabulary 8

Science Words To Learn

TermDefinition
Regulation to control or direct by a rule, principle, method, etc.
Stimulus a thing or event that evokes a specific functional reaction in an organ or tissue.
Neuron a specialized cell transmitting nerve impulses; a nerve cell.
Impulse the change of momentum of an object when the object is acted upon by a force for an interval of time.
Effector an organ or cell that acts in response to a stimulus.
Receptors an organ or cell able to respond to light, heat, or other external stimulus and transmit a signal to a sensory nerve.
Response something constituting a reply or a reaction
Neurotransmitters a chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse and, by diffusing across the synapse or junction, causes the transfer of the impulse to another nerve fiber, a muscle fiber, or some other structure.
Irritability a set of equipment used to generate and transmit electromagnetic waves carrying messages or signals, especially those of radio or television.
Dendrites a short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body.
Cyton (cell body) the central part of a neuron (cell that sends and receives messages within the brain and nerves)
Axon the long threadlike part of a nerve cell along which impulses are conducted from the cell body to other cells.
Hormones a regulatory substance produced in an organism and transport in tissue fluids such as blood or sap to stimulate specific cells or tissues into action.
Glands an organ in the human or animal body which secretes particular chemical substances for use in the body or for discharge into the surroundings.
Target cells/tissues/organs any cell that has a specific receptor for an antigen or antibody or hormone or drug, or is the focus of contact by a virus or phagocyte or nerve fiber etc.
Hypothalamus the activity of the pituitary, controlling body temperature, thirst, hunger, and other homeostatic systems, and involved in sleep and emotional activity.
Hyposecretion production of a bodily secretion at an abnormally slow rate or in abnormally small quantities.
Hypersecretion excessive production of a bodily secretion (as gastric acid, mucus, or growth hormone)
Feedback mechanism A loop system in which the system responds to perturbation either in the same direction (positive feedback) or in the opposite direction (negative feedback)
Reflex an action that is performed as a response to a stimulus and without conscious thought.
Cerebrum the integration of complex sensory and neural functions and the initiation and coordination of voluntary activity in the body.
Cerebellum the part of the brain at the back of the skull in vertebrates. Its function is to coordinate and regulate muscular activity.
Medulla oblongata the inner region of an organ or tissue, especially when it is distinguishable from the outer region or cortex (as in a kidney, an adrenal gland, or hair).
Created by: 1011018
 

 



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