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The Brain (biology Only) (GCSE Biology)

The following is a GCSE Biology test covering 'The Brain (biology Only)' from the broader topic Homeostasis And Response. The test is geared towards the AQA exam board style syllabus.
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What is the main function of myelin around some neurons in the brain and spinal cord?
Which chemical messenger crosses a synapse to transmit a signal between neurons?
Which brain region controls coordination of balance and fine movement?
Which structure links the brain to the rest of the body and conducts reflex arcs?
Which part of the nervous system is primarily responsible for the `fight or flight` responses that mobilise energy?
How does the brain’s hypothalamus help to regulate blood glucose concentration?
Which gland, controlled by the hypothalamus, releases hormones to regulate other endocrine glands?
Which lobe of the cerebrum is principally involved in processing visual information?
During a sudden painful stimulus, which pathway produces a rapid involuntary withdrawal of a limb?
Which statement correctly distinguishes voluntary from reflex actions?
What is one ethical concern specifically associated with using deep brain stimulation in patients?