Chapter 29

Which of the following are not known to be present in human skin? a. thermoreceptors b. electromagnetic receptors c. pressure receptors d. pain receptors

Eighty-year-old Mr. Johnson was becoming slightly deaf. To test his hearing, his doctor held a vibrating tuning fork tightly against the back of Mr. Johnson's skull. This sent vibrations through the bones of the skull, setting the fluid in the cochlea in motion. Mr. Johnson could hear the tuning fork this way, but not when it was held away from the skull a few inches from his ear. The problem was probably in the ____. (Explain your answer.) a. auditory nerve leading to the brain b. hair cells in the cochlea c. bones of the middle ear d. fluid of the cochlea

We know that sea turtle hatchlings use Earth's magnetic field to navigate. Do they also use light cues from the moon to get from the sand to the ocean waves? Outline an experiment to answer this question.

Have you ever felt your ears ringing after listening to loud music? Can this permanently impair your hearing? Should manufacturers of music devices and producers of concerts be required to warn consumers? What effect might warnings have?