NAME______

Sensory System

PART ONE:

  1. Match the following statements to the terms listed in the key.

KEY: a. chemoreceptorsb. mechanoreceptorsc. proprioceptors

d. Thermoreceptorse. pain receptorsf. photoreceptors

______located only in the eye

______monitor the pH of the blood

______detect tissue damage

______sensitive to changes in heat and cold

______hearing

______taste and smell

PART TWO:

Indicate whether the following statements are true (T) or false (F). Rewrite the false

statements in questions 2-9 to make true statements.

  1. _____ There are receptors in the epidermis, dermis, and subcutaneous layer.
  2. _____ Each receptor is stimulated by various stimuli, such as heat, cold, touch, pressure, and pain.
  3. _____ When stimulated, a receptor generates a nerve impulse that travels in a sensory neuron to the CNS.
  4. _____ Each type of receptor is sensitive to only one stimulus.
  5. _____ Sensation occurs in the brain and not at the receptor.
  6. _____ Receptors generate nerve impulses.
  7. _____ Receptors are uniformly distributed throughout the skin.
  8. _____ Receptors are a part of a reflex arc.

10. Match the types of receptors with the sense that they detect:

a. pressureb. heatc. coldd. paine. touch

_____ free nerve endings_____ Meissner corpuscles

_____ Merkel disks_____ Pacini corpuscles

_____ Krause end bulbs_____ Ruffini endings

PART THREE:

  1. Match items in the key to the statements that follow.

KEY: a. taste receptors b. smell receptors c. both taste and smell receptors

_____ a. plasma membrane receptors combine with chemical

_____ b. brain senses impulses as a weighted average

_____ c. taste buds with microvilli house receptors

_____ d. salty receptors on tip of tongue

_____ e. olfactory cells

_____ f. are not effective when you have a cold

_____ g. easily adapt to outside stimuli

_____ h. involved in enjoyment of food

  1. The senses of taste and smell work because specific ______in the organs of taste

and smell conbine with ______in the air or food. Both senses thus employ

______to detect changes in the environment.

PART FOUR:

  1. Using the list of terms and the answer blanks provided, state the name and function of each part of the eye indicated in the illustration.

Choroid

Ciliary body

Cornea

Fovea centralis

Iris

Lens

Optic nerve

Retina

Sclera

STRUCTURE / FUNCTION
a.
b.
c.
d.
e.
f.
g.
h.
i.
  1. Considering the layers of the retina – rods and cones/bipolar cells/ganglionic cells – which of these are at the back of the retina (closest to the choroids)?

Which of these are receptors for sight?

Which of these are fewer in number?

  1. The lens is ______for distant objects and ______for close

objects. This is called ______.

  1. Refer to the following diagram. The region where the optic nerves cross is called the

______chiasma. This diagram illustrates the manner in which humans

achieve ______vision.

  1. The receptors of sight are classified as ______. Two kinds exist:

______perceive motion and are responsible for night vision, and

______perceive color.

  1. Vision pigments. Rods have a pigment called ______, which is made up of the

protein ______and a pigment molecule called ______, a derivative of

vitamin A. When light strikes the pigment molecule, the rhodopsin is activated. Color

vision depends on ______kinds of cones, each of which has a slightly

different structure of ______molecule. Each is able to detect a

different wavelength, or color, of light

  1. Fill in these blanks in this table:

NAME / DESCRIPTION / IMAGE FOCUSED / CORRECTION
Nearsightedness / See nearby objects / Concave lens
Farsightedness
Astigmatism / Cannot focus / Image not focused

PART FIVE:

  1. Using the list of terms and the answer blanks provided, state the name and function of each part of the ear indicated in the illustration.

Auditory canal

Cochlear nerve

Auditory tube

Cochlea

(malleus) hammer

pinna

semicircular canal

(stapes) stirrup

tympanic membrane

vestibule

STRUCTURE / FUNCTION
a.
b.
c.
d.
e.
  1. Use this key for matching.

KEY a. semicircular canalsb. utricle and saccule

Contains otoliths ______

Dynamic equilibrium ______

Static equilibrium ______

  1. Put these items in the proper order, by rearranging the letters, to describe how we hear.

_____a. nerve impulses

_____ b. tympanic membrane oscillates

_____ c. fluid pressure waves in cochlear canal

_____ d. stapes hits oval window

_____ e. temporal lobe of brain

_____ f. stimulation of organ of Corti

  1. What happens when the basilar membrane moves up and down?