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7thHumBio-Ch6Sec 3&4

7th Grade Human Biology Chapter 6 Sec. 3 and 4

QuestionAnswer
cornea the clear tissue that covers the front of the eye
pupil the opening through which light enters the eye
iris a circular structure that surrounds the pupil and regulates the amount of light entering the eye
lens a flexible structure that focuses light
retina the layer of receptor cells that lines the back of the eye
nearsightedness to see nearby objects clearly, but have trouble seeing objects far away
farsightedness to see distant objects clearly, but nearby objects are blurry
eardrum a membrane that vibrates when sound strikes it and it separates the outer ear from the middle ear
cochlea a snail shaped tube that is lined with receptor cells that respond to sound
semicircular canals structures in the ear that are responsible for your sense of balance
drug any chemical taken into the body that causes changes in a person's body or behavior
drug abuse the deliberate misuse of drugs for purposes other than medical ones
tolerance a state in which a drug user needs larger amounts of the drug to produce the same effect on the body
addiction the body becomes physically dependent on the drug
withdrawal a period of adjustment that occurs when a person stops taking a drug on which the body is dependent
depressants drugs that slow down the activity of the central nervous system
stimulants drugs that speed up body processes
anabolic steroids synthetic chemicals that are similar to hormones produced in the body
alcoholism disease in which a person is both physically addicted to and emotionally dependent on alcohol
Created by: Karen Copanic
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