14. What are the names of the chemoreceptors that respond to molecules in air an
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14. What are the names of the chemoreceptors that respond to molecules in air and water? Thought Questions 15. Explain why people who develop cataracts (cloudy eye lenses) require surgery to implant new lenses. 16. When you stared at the dark cross with your left eye, why did the dark circle "disappear" from view as you moved the illustration toward you? 17. In a drag race, drivers must wait until the green light is illuminated before they can move their vehicle. Explain why a time delay exists, based on the information presented in this exercise.Explanation / Answer
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Question 14
Peripheral chemoreceptors are so named because they are sensory extensions . These polymodal sensors respond to variations in a number of blood properties, including Peripheral chemoreceptors in air versus water breathers.
Question 15
A cataract is a clouding of the lens inside the eye, causing vision loss that cannot be corrected with glasses, contact lenses that is why to required surgery to implant the lenes.
A cataract is a clouding of the eye's natural lens, which lies behind the iris and the pupil. Cataracts are the most common cause of vision loss in people over age 40 and is the principal cause of blindness in the world.
Driving can be affected — which could be dangerous — and so can overall quality of life. Many people become legally blind from untreated cataracts, and cataracts can even cause total blindness if left untreated for long periods. If you're tempted to put off your cataract surgery, discuss it with your eye doctor.
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Prevention includes wearing sunglasses and not smoking. Early on the symptoms may be improved with glasses. If this does not help, surgery to remove the cloudy lens and replace it with an artificial lens is the only effective treatment. Surgery is needed only if the cataracts are causing problems and generally results in an improved quality of life.
Question 16
Hold the card at eye level about an arm’s length away. Make sure that the cross is on the right.Close your right eye and look directly at the cross with your left eye. Notice that you can also see the dot.
Focus on the cross, but be aware of the dot as you slowly bring the card toward your face. The dot will disappear, and then reappear, as you bring the card toward your face. Try moving the card closer and farther to pinpoint exactly where this happens.Now close your left eye and look directly at the dot with your right eye. This time the cross will disappear and reappear as you bring the card slowly toward your face.Try the activity again, this time rotating the card so that the dot and cross are not directly across from each other
The optic nerve—a bundle of nerve fibers that carries messages from your eye to your brain—passes through one spot on the light-sensitive lining, or retina, of your eye. In this spot, your eye’s retina has no light receptors. When you hold the card so the light from the dot falls on this spot, you cannot see the dot. The fovea is an area of the retina that is densely packed with light receptors, giving you the sharpest vision.
Question 17
Human reaction time compared with anticipated green light.
Prevention includes wearing sunglasses and not smoking. Early on the symptoms may be improved with glasses. If this does not help, surgery to remove the cloudy lens and replace it with an artificial lens is the only effective treatment. Surgery is needed only if the cataracts are causing problems and generally results in an improved quality of life.
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