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 brainb. hair cells in the cochleac. bones of the middle eard. fluid of the cochlea

If you look away from this book and focus your eyes on a distant object, the eye muscles _________ and the lenses _________ to focus images on the retinas.a. relax . . . flattenb. relax . . . become more roundedc. contract . . . flattend. contract . . . become more rounded

Considering that sounds and odors both trigger changes in the patterns of action potentials in sensory neurons, how does the brain perceive which sense is which when the action potentials reach the brain?a. The action potentials stimulated by sounds are different in size and shape from those stimulated by odors.b. The axons from different sensory neurons go to different areas of the brain.c. Mechanoreception is not consciously perceived by the brain, whereas chemoreception is.d. Chemoreception is not consciously perceived by the brain, whereas mechanoreception is.

How does your brain determine the volume and pitch of sounds?

Give three examples of how the sensory abilities of an animal correlate with its habitat or method of finding food and mates.

Compare and contrast the lateral line system of fishes with electroreception in sharks.

When you first sit down to read in a coffee shop, the surroundings seem very loud. Yet after a few minutes reading you realize you hardly notice the noise at all. Why is that?

Scientists generally think that a 'good hypothesis' is one that is reasonable and testable and inspires further research into a phenomenon. Using these criteria, explain whether Dalton's hypothesis about color vision was a good hypothesis. Was it correct?

Hold your right eye closed. With your left eye, look at the + in the image below. Starting from about two feet away, slowly bring your head closer while looking at the +. What happens to the dot when you get close to the image? What property of the eye's structure does this exercise demonstrate?