BIOLOGY B1.txt

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shotguniall
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253864
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BIOLOGY B1.txt
Updated:
2013-12-19 10:07:53
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Biology B1
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BIOLOGY B1
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  1. Why are motor neurones so well adapted? (3reasons)
    • They have insulation sheaths (no loss of current)
    • They are long
    • They have branched endings for communication
  2. What are antibiotics ?
    • Chemicals made by fungi or bacteria that can be used as medicine to kill other fungi/bacteria
    • They cannot handle viruses
  3. What does the iris do?
    Controls the amount of light entering the eye
  4. What two things does the lens do?
    • 1) refracts light-rays, focuses light
    • 2) changes shapes depending on whether we want to see up close or far away
  5. Go through the reflex arc
    • Stimulus
    • Receptor
    • Sensory neurone
    • Relay neurone
    • Motor neurone
    • Effector
    • Response
  6. Explain how impulses get from one neurone to another
    Neurotransmitters are released allowing impulse to be diffused across the synapse and fired across
  7. List four pathogens and examples for each one
    • Fungi - athletes foot
    • Bacteria- cholera
    • Virus - flu
    • Protozoa- malaria
  8. What do anti virals do?
    Stop viruses multiplying inside a host
  9. What natural defence so we have on our face? (List five)
    • Eyelashes
    • Ear hairs
    • Nose hairs
    • Saline tears
    • Saliva
  10. What does EAR mean and stand for?
    • How is it calculated?
    • Estimated average requirement of protein a person should eat each day
    • It is calculated by 0.6 x body mass (kg)
  11. What is the difference between a vaccine and a vaccination?
    • Vaccine: drug in syringe
    • Vaccination: when you get the drug
  12. What happens in the retina?
    The focused image forms. The retina is sensitive to light
  13. What is an infectious disease?
    A disease that is caused by a parasite that invades your body
  14. How would you calculate your BMI?
    • Mass
    • ------
    • Height (m2)
  15. What is monocular vision?
    • Eyes on either side, cannot judge distances, gets a wide view. Often the vision of prey animals
    • Example: horses
  16. What might children suffer from if they don't get enough protein?
    Kwashiorkor
  17. What is first class protein?
    Meat. It contains amino acids
  18. What is second class protein?
    Plants. Doesn't contain amino acids.
  19. What are the two different types of tumours?
    • Benign (non cancerous)
    • Malignant (cancerous)
  20. List three ways a person can reduce the risk of developing cancer
    • Do not smoke
    • Do not drink
    • Stay out of UV light
    • Keep exposure to dangerous fumes low
    • Eat healthy with a diet full of vitamins and minerals
  21. What is a 'host'?
    An organism that has been invaded by a virus or a parasite
  22. What is a parasite?
    A dangerous micro-organism
  23. What is systolic pressure?
    • The first number you are given when your blood pressure is measured.
    • It tells you the highest point of pressure that the heart pumps blood
  24. Where is fat stored?
    Underneath skin and around the organs
  25. What does it mean to be long sighted? How can you solve the problem?
    Your eyeball is too short. A pair of glasses with convex lens helps the problem
  26. What are gaps between neurones called?
    Synapses
  27. What does it mean if someone is short sighted? What can be done to solve the problem?
    Their eyeball is too long. A pair of glasses with concave lens help

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