Exercise 7 Human Physiology The Senses Worksheet Leah Gray 10 6 2013 41085 1 Use your text or another reference source to describe what 20 20 vision means What general type of number would you expect to find in a person with myopia 20 20 vision is a term used to express normal visual acuity the clarity or sharpness of vision measured at a distance of 20 feet A person with myopia might have the vision of 20 100 Visual Acuity What Is 20 20 Vision Visual Acuity What Is 20 20 Vision American Optometric Association n d Web 06 Oct 2013 2 Explain why a person cannot have both myopia and hyperopia at the same time but can have astigmatism with either myopia or hyperopia Myopia means that the eyeball is slightly longer or cornea has a curve Hyperopia is a shorter than normal eyeball and a flat cornea You could not have both of these in your eyes because it would be impossible for your eye to be both longer and shorter at the same time With an astigmatism you can have it with myopia and hyperopia because the eye looks like a football and this can be longer or shorter as well Eye Care Specialists Eye Care Specialists N p n d Web 06 Oct 2013 3 Sound localization depends on two factors the difference in the loudness of the sound in each ear and how long was required for the sound to arrive at each ear Explain how these two factors leads to your brain determining where a sound originates The brain compares the information that comes from the left and right ear and determines which direction a sound is coming from 4 Summarize your results from exercise 3 How does the width of the wire caliper relate to density number of touch receptors in an area of skin My results were all over the place I expected the forearm to be the most sensitive and it was Nerve endings are not distributed evenly all over the body so the touch receptors did not feel the same at different points on the body The elbow and forearm were the most drastic results I had 5 Explain why it is helpful that some sensory receptors quickly adapt but other receptors slowly if ever adapt Fast acting sensory adapters are things such as smell that do not cause harm but slow sensory adapters are there to protect us such as putting your hand on a hot stove If we didn t have these adapters then there would be potential dangers to our body that we would have no idea were happening
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