Topic B3:Organism Level Systems; Flash Questions 0.0 / 5 ? BiologyHomeostasisGCSEOCR Created by: MiriamLCreated on: 13-07-20 14:46 What do nerve cells have? Nucleus, cytoplasm and cell membrane 1 of 25 What are most responses? Voluntary (consious) 2 of 25 What are the stages of a reflex arc? Stimulus, receptor, sensory neurone, spinal cord (relay neurone), motor neurone, effector, response 3 of 25 Why are reflexes hard to measure with a stop watch? The timer also has a reaction time 4 of 25 What happens to incoming light rays into the eye? Refracted by cornea 5 of 25 What does this do? Provides most of the focus of the image on the retina 6 of 25 How does light get to the lens Via the pupil 7 of 25 What the lens do? Also refracts the light 8 of 25 What do the light sensitive cells do? Produce a nerve impulse when light falls on them that travels via the optic nerve to the brain which interprets them into visual image 9 of 25 How is short sight corrected? Concave lens that bends the light outwards 10 of 25 How is long sight corrected? Convex lens that refracts the light more before it enters the eye 11 of 25 What are the two types of colour blindness? Red-green, red-blue 12 of 25 What does the brain do? Processes all the information collected by receptor cells about changes in your internal and external environments 13 of 25 What system does you brain reviece and process? Hormonal 14 of 25 With all this information what does the brain do? Creates a coordinated response 15 of 25 What does having a central control system mean? Neuronal communication is much fster than if control centres for different functions were spread around your body 16 of 25 How many neurones does an adult brain contain? 86 billion 17 of 25 What is your brain protected by? Skull and protective membranes 18 of 25 Do scientists fully understand the brain? No 19 of 25 In the past how did scinetists map the brain? Using evidence from stroke victims. 20 of 25 How do CT scns work? Use x-rays to create 3D images of the inside of the body 21 of 25 What can the position of abnormalities be linked to? Changes in a patients behaviour 22 of 25 Why can't CT scans be used regularly? x-ray radiation increases risk of cancer 23 of 25 How does MRI scns work? Use powerful magnets to identify brain abnormalities? 24 of 25 What does fMRI do? Produces images in real time, showing brain areas with increased blood flow. 25 of 25
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