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Biology Communication
Biology
1 Found helpful • 30 Pages • Complete Study Notes • Year: Pre-2021
Biology Revision: Communication Syllabus point 1a –identify the role of receptors in detecting stimuli: ➢ The role of receptors in detecting stimuli is to detect changes in the internal and external environment, so if necessary a response may occur. ▪ Receptors are vital to keeping your body functioning properly. ✓ Example: if you did not have chemoreceptors in your blood vessels to detect the amount of carbon dioxide present, you would not automatically exhale excess carbon dioxide before it reaches toxic levels in your body. (a stimulus is a change in the environment) ! Syllabus point 1b –explain the response to a stimulus involves: (stimulus, receptor, messenger, effector, response) ➢ The response to a stimulus involves receptors detecting the stimuli, messengers sending a nerve impulse and effectors carrying out the response. ▪ In this order a stimulus may produce a response; a receptor must detect the stimulus. A message must then be passed to a messenger, which may be a nerve or a hormone. The messenger then passes this information to an effector, which may be a gland or muscle, which responds to the information. ✓
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