Evaluate the following statements according to the information presented in this chapter. Select True or False for each statement.
T/F Most human eyes have one type of rod and three types of cones.
T/F Rods are more sensitive to dim light than cones are.
T/F Nocturnal animals have fewer rods than diurnal animals.
T/F Both rods and cones use retinal and opsins to detect light.

In the human ear, how do different hair cells respond to different frequencies of sound?

a. Waves of pressure move through the fluid in the cochlea.

b. Hair cells are 'sandwiched' between membranes.

c. Receptor proteins in the stereocilia of each hair cell are different; each protein responds to a certain range of frequencies.

d. Because the basilar membrane varies in stiffness, it vibrates in certain places in response to certain frequencies.

Which of these statements about taste is true?

a. Sweetness is a measure of the concentration of hydrogen ions in food.

b. Sodium ions from foods can directly depolarize certain taste cells.

c. All bitter-tasting compounds have a similar chemical structure.

d. Sourness is detected when hydrogen ions bind to membrane receptors.

What type of sensory system do migrating birds use to detect direction?

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.