Chapter 17 Part 2

Question 1

Retina: Deepest layer has

Answer 1

photoreceptors

Question 2

Rods-sensitive to

Answer 2

low light but not colors

Question 3

Cones-sensitive to colors in

Answer 3

bright light

Question 4

Fovea-point in back of eye where light

Answer 4

converges-forms point of sharpest focus

Question 5

Photoreceptors-Proportion of rods/cones varies in different

Answer 5

animals

Question 6

Photorecpt: Nocturnal animals/many verts have few or no

Answer 6

cones (all verts have some rods)

Question 7

Photorecept: Diurnal (day) animals have both

Answer 7

rods/cones

Question 8

Mechanoreceptors: Types are

Answer 8

Hair cells and Neuromast organs

Question 9

Hair cells-respond selectively; have

Answer 9

directionality

Question 10

Neuromast organs-collection of

Answer 10

hair cells/sensory nerves

Question 11

(3) Neuromast organs seen in..

Answer 11

Lateral Line system (water currents), Vestibular Apparatus (equilibrium), Auditory system (sound)

Question 12

Lateral line system: primary funct. is

Answer 12

navigation for aquatic verts

Question 13

Lateral Line syst.: lateral line canals/neuromasts concentrated on

Answer 13

head/along side of body

Question 14

Auditory system in mamm. (ear)- (3) External:

Answer 14

Most mamm. have pinna, external auditory meatus (ear canal), Paired ears provide stereoscopic hearing

Question 15

Middle: Tympanum -thin memb. (ear drum), middle ear activity, (3) middle ear bones are

Answer 15

ossicles-stapes, incus/malleus amplify vibrations

Question 16

Inner: includes

Answer 16

vestibular apparatus, cochlea, and surrounding spaces

Question 17

Cochlea contains hair cells (neuromasts or Organ of Corti) that respond to

Answer 17

sound waves

Question 18

Vestibular apparatus: balancing organ-fluid-filled channels in

Answer 18

inner ear

Question 19

VA: Contains semicircular canals-respond to

Answer 19

rotation

Question 20

VA: Hair cells respond to changes in orientation within a

Answer 20

gravitational field

Question 21

VA: All verts but amph. have special. region in VA for..

Answer 21

sound reception (versions of cochlea)