1. Test your partner's ability to recognize the difference between one or two points of skin being stimulated simultaneously. To do this, follow these steps:
a. Have your partner place a hand with the palm up on the table and close his or her eyes.
b. Hold the tips of a forceps tightly together and gently touch the skin of your partner's index finger.
c. Ask your partner to report if it feels like one or two points are touching the finger.
d. Allow the tips of the forceps to spread so they are 1 mm apart, press both points against the skin simultaneously, and ask your partner to report as before.
e. Repeat this procedure, allowing the tips of the forceps to spread more each time until your partner can feel both tips being pressed against the skin. The minimum distance between the tips of the forceps when both can be felt is called the two-point threshold. As soon as you are able to distinguish two points, two separate receptors are being stimulated instead of only one receptor.
f. Record the two-point threshold for the skin of the index finger in Part C of the laboratory report.
2. Repeat this procedure to determine the two-point threshold of the palm, the back of the hand, the back of the neck, the leg, and the sole. Record the results in Part C of the laboratory report.
3. Answer the questions in Part C of the laboratory report.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.