sense organs - Organs that detect changes in external environment., Stimulus - A change in the environment that the body can detect, Receptors - Parts of a nerve cell that detect stimuli, Photoreceptors - receptors that detect light, contact receptors - receptors that detect pain and touch, nervous system - the network of nerve cells and fibres that receive and send electrical impulses between parts of the body., Interneurons - Neurons that interpret sensory input and coordinate a response, motor neurons - takes impulses from interneurons to effectors, such as muscles or glands, to carry out a response, Synapse - Gap between neurons, negativefeedbackloop - Causes a system to respond in the opposite direction from the stimulus, peripheral - ____ nervous system: the sensory and motor neurons that connect the CNS to the rest of the body, Reflex action - rapid and automatic responses to stimuli, spinal cord - Nerves that run up and down the spine and send most messages between the body and brain, Effector - a muscle or gland that acts in response to a stimulus., automatic - responses without conscious control, Hormones - chemicals transported through the bloodstream to target organs that bring about a particular response., target organ - Tissues or organs on which hormones act, Homeostasis - The maintenance of a constant internal environment, Pancreas - An organ that regulates the level of sugar in the blood, Insulin - hormone that lowers blood glucose levels,

(Year 9) Control Systems Glossary

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