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GCE O Level Biology: Definitions of Keywords from Homeostasis, Nervous system, Eye and Hormones
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Homeostasis
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Maintenance of a constant internal environment
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Revise definitions of key terms from these chapters
Terms in this set (25)
Homeostasis
Maintenance of a constant internal environment
Stimulus
A change from the normal condition
Receptors
Organs in the body that detect changes in body conditions
Negative feedback
Reverse effect of a stimulus to restore the normal conditions of the internal environment
Vasoconstriction
Reduction in internal diameter of blood vessels in body to reduce the amount of blood flow
Vasodilation
Increase in internal diameter of blood vessels in body to increase amount of blood flow
Response (to a stimulus)
Reaction of an organism to a stimulus
Effectors
Organs or cells in the body that produce a response when stimulated by a nerve impulse
Synapse
Junction between two neurones or a junction between a neurone and an effector
Nerve impulse
Electrochemical signal
