By W. Belfield, M. Dearden and G. L. Watt (Auth.)
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Extra info for A Practical Course in Biology
Of Sellotape over it, pressing the tape firmly into place (Fig. 14 (ii)). The drying only takes a minute or so. Now peel the Sellotape off the hand (Fig. 14 (iii)) and stick it onto a microscope slide (Fig. 14 (iv)). As the tape peels off, the Formvar should peel off the hand stuck to the sticky side of the tape (Fig. 14 (iii and iv)). Examine under a microscope as you would an ordinary microscope slide. Method 3. It is also sometimes possible to show the surface anatomy of the skin by the nail varnish technique described in Method 2 (p.
Now tap the triceps tendon just above the elbow with your bent finger-tips (the fingers together) or with a tendon hammer. Note which way the arm jerks. Which muscle has contracted? Note: Exercises 2, 3 and 4 above are not easy to perform and you should therefore not be disappointed by any lack of success. The first exercise should work well, however. 44 3. THE MAMMAL Tap here Chair FIG. 18. Achilles jerk. FIG. 19. Triceps jerk. 5. Blinking reflex Move something in front of your partner's eyes unexpectedly, and note the immediate blinking.
After 15 seconds or so the subject writes down which food he thinks is in his mouth. Repeat the experiment a number of times. Also try the same experiment with someone suffering from a cold and who has consequent loss of smell. Exercise to investigate the function of the various types of teeth Method. Obtain as many different kinds of untreated food as possible, and, by the use of as large a variety of tools as possible, try to reduce the foods into small fragments. Examples of the kind of tools which would be useful would be a pestle and mortar, pliers, pincers and scissors.