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Agenda

Agenda. (B Day) Agenda DSJ #45 Sight and Hearing – Part 1 (Notes) Diagrams DSR #45. Agenda. (A Day) Agenda DSJ #45 Sight and Hearing – Part 1 (Notes) Diagrams DSR #45. DSJ #45. Science Notebook – 24B

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Agenda

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  1. Agenda (B Day) Agenda • DSJ #45 • Sight and Hearing – Part 1 (Notes) • Diagrams • DSR #45

  2. Agenda (A Day) Agenda • DSJ #45 • Sight and Hearing – Part 1 (Notes) • Diagrams • DSR #45

  3. DSJ #45 • Science Notebook – 24B • Prompt: Hold your finger close to your face and look at the tip of it. What do you notice about the background? Keep your finger there and look at the room. What do you notice about your finger? Describe in 5 sentences or more.

  4. Sight and Hearing – Part 1 (Notes) • Use the textbook to answer Part 1 of your Sight and Hearing notes. • The textbook page numbers are on your paper. • Do NOT do Part 2!!!! (We will do Part 2 next time.) • Place the paper in your notebook. (Do not glue it in yet and DON’T LOSE IT!)

  5. Sight and hearing – Part 1

  6. Learning Objective • Explain how the eyes sense light.

  7. Vision • Your eyes respond to the stimulus of light. They convert that stimulus into impulses that your brain interprets, enabling you to see.

  8. Vision • 1. The iris is a circular structure that surrounds the pupil and regulates the amount of light entering the eye. It also gives the eye its color. b.

  9. Vision • 2. The lens is a flexible structure that focuses light. e.

  10. Vision • 3. The cornea is the clear tissue that covers the front of the eye. d.

  11. Vision • 4. The pupil is the opening through which light enters the eye. c.

  12. Vision • 5. The retina is a layer of light-sensitive cells that lines the back of the eye. a.

  13. 6. Light coming from an object enters your eye through the pupil. The light is focused by the lens. An upside-down image is produced on your retina. Receptor cells respond to the light. Receptors then send impulses to your cerebrum. Cerebrum turns the image right-side up.

  14. Vision • There are two types of receptors: rods and cones.

  15. Vision • 7. Rod cells work best in dim light and enable you to see black, white, and shades of gray. Cone cells work best in bright light and enable you to see colors. False

  16. Vision • The rods and cones send electrical impulses to the brain through the optic nerve.

  17. Vision • The cerebrum, or the brain, interprets the signals and does two things to the image.

  18. Vision • The cerebrum, or the brain, interprets the signals and does two things to the image. • 8. • a. It turns the reversed image right-side up.

  19. Vision • The cerebrum, or the brain, interprets the signals and does two things to the image. • 8. • a. It turns the reversed image right-side up. • b. The brain combines the images from each eye.

  20. Vision • The lens is a flexible structure that focuses light.

  21. Vision • 9.

  22. Sight and Hearing Diagrams • Use the textbook on pages 615 and 619 to label the diagrams of the eye and ear. • It must be colored. • Glue onto page 23A of your notebook when finished.

  23. Glue in SNB **Please remember to use only TWO drops of glue!!** If everyone uses only TWO drops, a lot of glue is saved over time…. • 23A - Diagrams

  24. DSR #45 • Science Notebook – 24B (Under DSJ #45) • Prompt: What part of the eye lets light in? How does the image appear when it first enters the eye? How is this image corrected?

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