Biology (B1): The Nervous System 0.0 / 5 ? BiologyNervous system, hormones and behaviourGCSEAQA Created by: rfazendeiroCreated on: 03-02-16 18:50 What does the nervous system control in the body? Controls behaviour, carries electrical signals to and from the brain, allows humans to react to their environment. 1 of 22 Which two areas of the body control the central nervous system? Brain and spinal cord. 2 of 22 What are stimuli? Changes in the environment that (should) cause the human body to react. 3 of 22 What are receptors? Cells that detect stimuli. 4 of 22 What is a nerve impulse? An electrical message to the brain. 5 of 22 Where does the nerve impulse travel? Along a neurone. 6 of 22 What is a neurone? A nerve cell that carries tiny electrical signals to and from the brain. 7 of 22 Why are neurones so long? So impulses can travel quickly to and from the brain. 8 of 22 Why do neurones have branched ends? To allow connections to other branches to be made. 9 of 22 Why do neurones have an insulating sheath? To maintain the nerve impulse. 10 of 22 What is a nerve? A group of neurones connected to the central nervous system. 11 of 22 Where does the sensory neurone travel/run? From the receptor to the central nervous system. 12 of 22 Where does the motor neuron travel/run? Central nervous system to the effector. 13 of 22 What is an effector? A muscle or gland that is moved by/ is the end result of a reaction. 14 of 22 What is a synapse? Junction between nerve cells. 15 of 22 What happens to the chemicals released at one end of the synapse? They diffuse across the synapse. 16 of 22 What are the receptors in the ear sensitive to? Sound. 17 of 22 What are the receptors in the eyes sensitive to? Light. 18 of 22 What are the receptors in the nose sensitive to? Chemicals. 19 of 22 What are the receptors in the mouth sensitive to? Chemicals. 20 of 22 What are the receptors in the skin sensitive to? Changes in pressure or temperature. 21 of 22 What do reflex actions prevent the body from? Harm. 22 of 22
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