1) The maximum thickness of the skin under feet is a. 4 mm b. 2 mm c. 6 mm d. 8 mm
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2) Tears are useful because they help in a. keeping them from drying out b. Keeping dust or other particles out c. Washing away germs d. all of them
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3) The circular opening in the eye is known as a. cornea b. pupil c. retina d. iris
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4) Taste buds are located on a. tongue b. jaws c. gums d. palate
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5) To hear sound, the ear has to do a. direct the sound waves into the hearing part of the ear b. sense the fluctuations in air pressure c. translate these fluctuations into an electrical signal that the brain can understand d. all of them
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6) The organs that build sense of balance are known as a. respiratory system b. auditory system c. vestibular system d. digestive system
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7) The outer protective covering of human body is known as a. receptor b. skin c. layer d. sensory cell
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8) The inner lining at the back of the eye is known as a. retina b. iris c. lens d. cornea
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9) The image cast on our retinas is a. three-dimensional b. two-dimensional c. four-dimensional d. three dimensional
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10) Taste cells on our tongue that receive the stimulation of taste are known as a. taste buds b. cotton buds c. receptors d. tube
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