Biology Unit 5 AQA (Unit 9 Response to Stimuli) 3.5 / 5 based on 3 ratings ? BiologyA2/A-levelAQA Created by: RebeccaCreated on: 06-04-13 11:15 A detectable alteration to the internal or external environment of an organism that produces some change in that organism. Stimulus 1 of 17 A cell adapted to detect changes in the environment. Receptor 2 of 17 The change in the organism. Response 3 of 17 An organ that responds to stimulation by a nerve impulse resulting in a change or response. Effector 4 of 17 The central nervous system e.g. brain or spinal chord. Coordinator 5 of 17 The movement away from or towards a stimulus. Taxis 6 of 17 Speed in relation to the stimulus and how often direction changes Kinesis 7 of 17 Growth movement of part of a plant in response to a stimulus. Tropism 8 of 17 Made up of pairs of nerve that originate from either the brain or the spinal chord Peripheral Nervous System 9 of 17 Carry nerve impulses from receptors towards the Central Nervous System (CNS) Sensory Neurones 10 of 17 Carry nerve impulses away from the CNS to the effectors. Motor Neurones 11 of 17 Carry nerve impulses to the body muscles and is under conscious control. Voluntary Nervous System 12 of 17 Carries nerve impulses to the glands, smooth muscle and cardiac muscle and acts subconsciously. Autonomic Nervous System 13 of 17 Involuntary response to a stimulus Reflex 14 of 17 The nerve pathway in the body taken by an action potential that leads to rapid, involuntary response to a stimulus Reflex Arc 15 of 17 Stimulates effectors and so speeds up any activity. Sympathetic Nervous System 16 of 17 Inhibits effectors and so slows down any activity Parasympathetic Nervous System 17 of 17
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