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Stimulus and Response
2/26/2023
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Stimulus & Response Aim: To use observations to draw conclusions on how we respond to stimuli. Objectives • To define stimulus, response, internal stimulus, and external stimulus. Stimulus & Response Stimulus • A thing or event in the environment that causes a response Stimulus- singular Stimuli- plural • Example: Getting a drink when you feel thirsty Response • How an organism reacts to a stimulus A stimulus causes a response. • Example: An animal is cold so it moves into the sun Example: • Stimulus bright / dim light Response = pupil contracts / dilates+ • External & Internal Stimulus Caused External Stimuli • An external stimulus comes from outside an organism. Temperature, predators, food Stimulus Internal Stimulus • An internal stimulus comes from inside an organism Germs, dehydration, lack of energy, pain → Examples: •You have an infection so you run a fever A lion is tired so it takes a nap •A giraffe feels thirsty so it drinks some water Iris →Examples: •You feel cold so you put on a jacket A dog feels the heat of the sun so it lays in the shade Response Receptor Effector Pupil contracts Example: • You have a stomach ache and throw up (Internal Stimulus) • There is dust in the air so you cough / sneeze (External Stimulus) kW VAN Bright light Sensory Neuron Motor Neuron Response Cornea Relay Neuron Stimulus Pupil dilates (expands) Dim light Brain (CNS) Iris
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