Experiment 3 Sweat Gland Distribution Sweat glands also called sudoriferous glands are found all over the body and produce a waterlike substance composed of salt and water These glands function in body temperature regulation In this experiment you will measure the density of sweat glands in different areas of the body Materials Graph Paper Tape Betadine Swab Stopwatch Ruler Scissors You must provide Procedure 1 Carefully measure and cut out four 5 0 cm by 5 0 cm squares of graph paper Then locate a region on your right anterior forearm right palm right anterior thigh and right anterior foot that do not have large creases For example the elbow region would NOT be an ideal region for this experiment 2 Use the Betadine swab to paint a square on each of your selected regions This square should be slightly larger than the graph paper square s you cut out in Step 1 3 Allow the Betadine to dry for one minute Use the tape to secure a square of graph paper on each painted square Be sure the graph paper is securely fastened Keep the graph paper in place for approximately 20 minutes 4 After 20 minutes remove each graph paper square one at a time Count the amount of dots on the paper Each dot will appear as a dark blue brown or black and represents a sweat gland Record the density of sweat glands per cm 2 for each region in Table 2 Note Your Betadine swab may not produce a high number of dots if your body does not sweat very much This is normal 5 To remove the Betadine from your skin wash each area thoroughly with soap and water Table 2 Sweat Gland Distribution 2013 eScience Labs LLC All Rights Reserved Body Region Sweat Glands cm2 Right Anterior Forearm 10cm2 Right Palm 3 5cm2 Right Anterior Thigh 3 0cm2 Right Anterior Foot 0cm2 Post Lab Questions 1 What area of the body had the greatest density of sweat glands based on your experimental results What area had the lowest Why do you think this is The right anterior forearm had the greatest density of sweat glands The right anterior foot had the lowest density of sweat glands I think this could have occurred because the arm was moving around during the experiment and could have become warmer and the foot set still on the ground and didn t move to create any heat 2 What is the purpose of sweat glands Sweat glands are used to regulate the temperature of the body They excrete secretions directly onto the skin 3 If you were to perform this same test on a friend do you believe their results would be similar or different to yours Why or why not I think the results would be similar but they would probably have more sweat glands than me because I hardly sweat Whenever I work out I hardly ever have any sweat and most of my friends are sweating a lot while we exercise 2013 eScience Labs LLC All Rights Reserved
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