Biology 241 – Lecture
Chapter 16 (Sensory, Motor, and Integrative Systems)
Practice Quiz
I. Circle the letter preceding the one best answer to each question:
1. Choose the false statement about rods: A. There are more rods than cones in the retina.
B. Rods are concentrated in the central fovea and are less dense around the periphery of the retina.
C. Rods enable vision in dim (not bright) light. D. Rods contain the photopigment rhodopsin.
E. No rods are present at the region of the retina called the optic disk.
2. You cannot “hear” with your eyes because: A. hearing is a somatic sense and vision is a special sense.
B. the sensory neurons for sight carry information only for the modality of vision.
C. the impulses for hearing are transmitted to the somatosensory area of the cerebral cortex.
D. hearing receptors are selective and vision receptors are not.
E. hearing receptors produce a generator potential and vision receptors produce a receptor potential.
3. A nurse touches the lower back of a patient, but the patient does not feel (perceive) the sensation. Which of
the following could explain the lack of sensation? A. The touch stroke was done horizontally not vertically.
B. The generator potential had not reached threshold. C. The nurse was stimulating a proprioceptor.
D. There is damage to the motor region of the cerebral cortex. E. A slowly adapting receptor had been
stimulated.
4. Which of the following statements is incorrect?
A. The graded potentials produced by receptors that serve the senses of touch, pressure, stretching, vibration,
pain, proprioception, and smell are generator potentials.
B. The graded potentials produced by receptors that serve the special senses of vision, hearing equilibrium,
and taste are receptor potentials.
C. When a generator potential is large enough to reach threshold, it generates one or more nerve impulses in
its first-order neuron.
D. A receptor potential generates nerve impulses in a second-order neuron.
E. The amplitude of both generator and receptor potentials varies with the intensity of the stimulus.
II. Circle T (True) or F (False). If the statement is false, cross out the word(s) that make it false
and write in an appropriate correction so that the statement now becomes a true statement.
T F 5. Intrinsic eye muscles are responsible for changes in pupil size, accommodation of the lens, and
movement of eyes up and down and from side to side.
T F 6. The receptor organs for special senses are less complex structurally than those for general senses.
T F 7. The anterior cavity is filled with vitreous humor (aka the vitreous body).
T F 8. Infections in the pharynx often lead to ear infections because bacteria may spread through the
external auditory meatus to the middle ear.
T F 9. Nociceptors exhibit very little adaptation.
T F 10. The pons of the brainstem helps to monitor differences between intended movements and actual
movements for coordination, posture, and balance.
Biology 241 – Lecture
Chapter 16 Practice Quiz - continued
Page Two
III. Using the blanks provided, fill in the word or phrase that best fits the description given:
____________________________11. This is the conscious awareness and interpretation of sensory input.
____________________________12. This is the term describing the crossing-over of axons from one side of
the brain or spinal cord to the other side.
____________________________13. These are receptors located in muscles, tendons, joints, or the internal
ear that provide information about body position and movements.
_________, ________, ________ 14. These are the three cranial nerves that convey taste impulses (Use both
Roman Numeral designation and Name of the Cr. Nerves)
_______________, ____________15. Two structures of the eye that accomplish the most refraction.
IV. Match the following numbered structures with the description that best fits:
___16. “White of the eye”
A. Pupil
___17. Area of sharpest vision; area of densest concentration of cones
B. Ciliary muscle
___18. Most anterior portion of the eyeball; contains no blood vessels;
important in focusing images on the retina
C. Sclera
D. Iris
___19. A hole; appears black, like a circular doorway leading to a dark room
E. Central fovea
___20. Colored part of the eye; regulates the amount of light entering eye
F. Cornea
___21. Attaches to the lens by means of radially arranged fibers called the
zonular fibers
___22. Located at the junction of the iris and the cornea;
drains aqueous humor
G. Scleral venous sinus
(aka Canal of Schlemm)