AQA A level Biology - Topic 6 - survival and response questions and answers already passed

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AQA A level Biology - Topic 6 - survival and response questions and answers already passed What is a stimulus? ✔✔A change in the environment of an organism What is a tactic response? ✔✔Dir... ectional movement in response to a stimulus What is a kinetic response? ✔✔Non directional random movement in response to a stimulus What is a positive and negative taxis? ✔✔Positive taxis- organism moves towards stimulus Negative taxis - organism moves away from stimulus What Are receptors? ✔✔Detect stimuli- can be cells or proteins on cell surface membrane , loads of different types What are effectors? ✔✔Cells that bring about a response to a stimulus to provide an effect ( muscle cells, glands) Receptors communicate with effectors via the ....... ✔✔Nervous or hormonal system or both What are the 3 types of neurones? ✔✔Sensory neurones Motor neurones Relay neurones What do sensory neurons do? ✔✔They carry impulses from receptors to the CNS. What do motor neurones do? ✔✔Transmit electrical impulses from the central nervous system to the effectors What do relay neurones do? ✔✔Transmit electrical impulses between sensory neurones and motor neurones What is the order of nervous communication including neurones ✔✔Stimulus > receptors > sensory neurones> CNS > motor neurone > effectors > response [Show More]

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