1) 80% of our brain tissue is liquid. a) True  b) False 2) Electrical signals in the nerve fibres travel around 280 kilometres per hour. a) True b) False 3) How many neurons does our brain contain? a) thousands   b) millions c) billions 4) The skull is made up of 1 bone.  a) True b) False 5) How much of the total energy released from respiration is used in the brain? a) 1% b) 8% c) 20% d) 80% 6) The left side of the brain controls the right side of the body and vice versa. a) True b) False 7) The CNS is responsible for tasting, smelling, seeing, hearing, thinking, dreaming, breathing, heart beating, moving, running, sleeping, laughing, singing, remembering, feeling pain or pleasure, painting, writing a) True b) False 8) Brains are not fully mature until about 25 years old. a) True b) False 9) If you practice a skill, your brain produces new connections between neurons to get better.  a) True b) False 10) The peripheral nervous system is made up of the brain and spinal cord. a) True b) False 11) Motor neurons allow our brains to control our muscles.  a) True b) False 12) Sensory neurons send messages from the brain to our organs. a) True b) False 13) What is a synapse? a) a special neuron b) a gap between neurons c) a nerve that carries messages 14) Sensory information is sent along the sensory neuron. a) True b) False 15) What does automatic mean?  a) done WITHOUT conscious thought b) done WITH conscious thought  c) brain is responsible 

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