How Organisms detect and respond to changes in environment. 0.0 / 5 ? BiologyHuman, animal and plant behaviourA2/A-levelAQA Created by: Abigail HowardCreated on: 12-05-13 14:50 Stimulus A change in the organism's external or internal environment. 1 of 13 Receptor A structure that detects the stimulus. 2 of 13 Effector A structure that produces the response e.g. muscle. 3 of 13 Response The action that results from the stimulus 4 of 13 Tropisms Responses of plants to external stimuli. 5 of 13 Taxis Movement of animals along a gradient of intensity of a stimulus. 6 of 13 Kinesis A change in the intensity of the stimulus brings about a change in the rate of movement. E.g. woodlice move faster is dry conditions than in wet. 7 of 13 Somatic Reflex A response to an external stimulus. E.g. the withdrawal reflex 8 of 13 Autonomic reflex A response to an internal stimulus. E.g. the reflexes controlling heart rate and breathing rate. 9 of 13 Generator potential A small change in the voltage across the surface membrane of a receptor caused by a specific type of energy. 10 of 13 Nerve impulse The passage of an action potential along a nerve cell. 11 of 13 Threshold level The level of stimulus required to initiate a nerve impulse. 12 of 13 Homeostasis Maintaining a constant internal environment. 13 of 13
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