Biology 12

162 MHR • Unit 2 Homeostasis

SECTION REVIEW

1. How is sensory information important to you?


2. List three parts of your body that relay sensory
   information to the brain.


3. Draw a diagram of the eye. Use a coloured
   marker to highlight those parts of the eye that are
   part of the nervous system. Use a differently coloured
   marker to highlight the part of the eye that is mostly
   muscle. Use a third coloured marker to highlight the
   parts of the eye that are vascular (tissue supplied
   by blood).


4. Describe the path of light through each part of
   the eye, from the outermost structure to the retina.


5. Explain why there is a blind spot in one portion
   of the retina.


6. Identify those parts of the eye that are
   responsible for allowing light in.


7. Identify those parts of the eye that are
   responsible for keeping light out.


8. Draw a feedback loop showing how the eye
   responds to low levels of light.


9. Distinguish between rod cells and cone cells
   and identify the advantage of each.


10. List three disorders of the visual system.


11. How would you explain to a young child the
    nature of the damage that can be done to the eye
    by staring directly at the Sun in the sky?


12. Describe how your eye focusses on details of
    close images, such as the words on this page. Make
    a sketch that shows how the lens of the eye changes
    shape as you focus on near and distant objects.


13. Identify how the skin collects information about
    the outside world.


14. Try the following experiment to find out which
    parts of your hand are most sensitive to touch. Push
    two pins through a small card, about 2 mm apart.
    Draw an outline of your hand. Have a lab partner
    lightlytouch the tip of the pins to different parts of
    your hands and fingers. Without looking, say whether
    you feel one or two pins for each test. Mark each test
    on the drawing, indicating whether you felt one or
    two pins. When finished, analyze the drawing to
    determine which parts of your hands and fingers
    are most sensitive to touch.


15. If you wear eyeglasses or contact lenses,
    investigate the type and strength of the corrective
    lenses you are using. Find out if the prescription for
    each eye is the same or different. If possible (and if
    your teacher judges it appropriate to do so), compare
    the corrective lenses you use to those used by your
    classmates. What type of corrective lenses are most
    common in your class? Discuss and debate the pros
    and cons of wearing eyeglasses versus contact
    lenses.


16. When you are outside on a sunny day, you feel
    heat, not light. How can you decide if a sowbug
    responds to light stimulus, but not heat stimulus?


17. A severe impact to the head can cause
    blindness. Understanding the mechanisms of sight
    involve study of brain activity as well as study of the
    eye. How can research into the neurology of vision
    be used to develop safe helmets?


18. Some activities put people at risk for injury. For
    one activity (such as hockey) identify how risk of
    injury can be reduced.


19. What can you do to prevent damage to your
    hearing from extremely loud or persistent noises in
    your environment? Is the school presently doing
    enough to protect student hearing? What types of
    policies could be adopted to help protect students
    from hearing loss while attending noisy school
    functions, such as school dances?

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