Starter: April 27th
Finish the functions for the Brain Stem on your foldable.
Log on to my website mrshuynhsays.weebly.com
Chapter 15, Section 3 Sight and Hearing
Vision Your eyes respond to the stimulus of light Cornea = clear tissue that covers the front of the eye Pupil = the opening through which light enters Iris = circular structure that surrounds the pupil and regulates the amount of light entering the eye Vision Try this with a partner: Look at the pupils in your partner’s eyes. Then close your eyes while they close theirs for about 15 seconds. Open your eyes and quickly look at each others’ pupils. What happens? http://www.boredpanda.com/animal-eyes-macro-photography-suren-manvelyan/ for extreme closeups of animal eyes
Light rays enter through the cornea How Light is Focused Light rays enter through the cornea The light passes through the pupil and strikes the lens, and flexible structure that focuses light The image that is produced on the retina is upside down and backwards Table Talk: Given what you learned about lenses earlier in the year, why is the image upside down on the retina? See BrainPop: “Eyes”
How you see an image Retina = a sheet of light sensitive cells that lines the back of the eyeball The retina contains: Rod cells = work best in dim light & allow you to see black, white & shades of gray Cone cells = work best in bright light & allow you to see colors Quick Write: Explain what you think is happening to your eyes when you walk from the bright outdoors into a darkened room. Each eye has an optic nerve, which sends electrical impulses to the brain
Pg. 615 Draw and label the Eye
Starter: May 1st Which type of cells help us see better at night?
Hearing Sound is produced by vibrations that travel as waves It travels through three regions of the ear: External ear Middle ear Inner ear
How we hear Sound waves enter the outer ear The ear canal directs the waves to the middle ear, where they strike the eardrum The ear drum sends the vibration to the hammer, anvil and stirrup, three small bones that act as levers to transmit the sound The stirrup then vibrates the cochlea, a snail shaped tube that is lined with nerve cells that respond to sound A nerve impulse is then transmitted to the brain See BrainPop: “Hearing: Say What?” Table Talk: How could you increase the amount of sound waves collected by the outer ear?
Your Inner Ear & Balance Semicircular canals = structures in the inner ear responsible for balance Located above the cochlea When you move your head, fluid in the semicircular canals sloshes around, sending nerve impulses to the brain If you are off balance, your brain tells your muscles to restore your balance Table Talk: Why do you suppose you feel dizzy for a while after you stop spinning around? Quick Write: Why may an infection of the inner ear cause you to lose your balance? end See BrainPop: “Balance”
Discussion Questions 1. Name some of the causes of hearing loss. 2. How do your ears get messages to your brain so you can interpret sounds around you? 3. Name some ways to care for your ears and protect your hearing. 4. “Are you listening?” is a common question asked by teachers. Are listening and hearing the same thing? 5. What do your ears help you do besides hear? 6. What challenges do hearing–impaired teens face?
Starter: May 3rd 1. “Are you listening?” is a common question asked by teachers. Are listening and hearing the same thing? 2. What challenges do hearing–impaired teens face?
Presentation Power point 1. At least 8 slides & picture on every slide. 2. Explain about the ear. 3. What is NIHL? 4. Described your assigned ear problem. 5. How do you prevent it? 6. How do you treat it? 7. Any other information. heymrshuynh@gmail.com
Starter: May 4th Explain the purpose of of the pupil.