Reflex and Sensory Physiology Hands-On Labs

Reflex and Sensory Physiology
Hands-On Labs, Inc.
Version 42-0019-00-02 Lab Report Assistant
This document is not meant to be a substitute for a formal laboratory report. The Lab Report
Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data
tables that should be addressed in a formal lab report. The intent is to facilitate students’
writing of lab reports by providing this information in an editable file which can be sent to an
instructor. Exercise 1: Taste and Smell
Data Table 1. Taste Observations: With and Without Smell.
Item Taste With and Without
the Sense of Smell Different Areas of the Tongue Salt
Lemon juice
Coffee grounds Questions
A. Describe how scent and taste work in conjunction. Are the tastes of all of the foods that
were tested heightened by the sense of smell, or only some of the foods? B. Were certain areas of your tongue more sensitive to tastes than others? Describe your
answer using your observations. Exercise 2: Hearing
Data Table 2. Hearing Tests.
Weber Test
Rinne Test
Balance Test Questions
A. What does it mean if you can hear the tuning fork more clearly in one ear or another
during the Weber test? B. How is the mechanism of hearing different if the handle of the tuning fork is held on the
mastoid process instead of holding the tuning fork tines near the ear canal? C. What types of mechanisms does the body use for balance? How does vision affect balance? D. Imagine that you were standing on a moving platform when performing the balance test.
How would this affect balance and why? Exercise 3: Blind Spots and Afterimages
Data Table 3. Measurements for Blind Spots.
Distance from Eye (Far) (cm) Distance from Eye (Near) (cm) Right Eye
Left Eye
Observations of
Afterimage Questions
A. The “blind spot” is more like a “blind sphere.” Is the depth (distance from where the circle
disappeared to where it reappeared in this exercise) approximately the same for each eye?
What does this indicate? B. Explain why a blind spot is not normally perceived. C. What is an afterimage? Why does it occur? Exercise 4: Testing a Stretch Reflex
Data Table 4. Testing the Patellar Reflex.
Leg/Conditions Tested
Right Leg
Left Leg
Right Leg with Distraction
Left Leg with Distraction Observations Questions
A. What causes the patellar reflex? B. Why is the patellar stretch reflex beneficial? C. Describe the nerve signal transmission from the stimulus to the response. D. What, if any changes, occurred when the volunteer was distracted while the reflex was
tested? Explain your results. Exercise 5: Dissection of a Cow Eye
Data Table 5. Photographs of Cow Eye Dissection.
Lateral View of the Exterior Eye
Label: cornea, sclera, and optic nerve
Internal Posterior Segment
Label: optic disc, retina, sclera, and
choroid Iris and Lens, Separated from the Eye
Label: cornea, sclera, iris, and lens Data Table 6. Observations of the Cow Eye Dissection.
Interior of Aqueous Chamber
Vitreous Body
Lens Observations Questions
A. What is refraction? Which portions of the eye primarily refract light before the light reaches
the retina? How did these areas appear in the cow eye? B. What is the function of the optic disc? C. What is the function of the choroid? How is the choroid different in cows than it is in
humans? What does the choroid look like on the cow eye?