A Practical Course in Biology by W. Belfield, M. Dearden and G. L. Watt (Auth.)

By W. Belfield, M. Dearden and G. L. Watt (Auth.)

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Correlate this with your observations above on the movement of the hairs in the dish after it had been revolved. MUSCULAR CONTROL OF POSTURE Exercise showing how the muscles automatically control posture Method. Place a piece of wood about 50 mm thick on the floor, and balance a plank of wood (or bench) across it (Fig. 24). Your partner, dressed in shorts, stands on the midpoint of the plank facing one end and in such a position that balance is obtained. Slowly raise the end the subject is facing and carefully watch the muscles of the legs.

Test each substrate before use as described below. Proteins. To 1 ml of the boiled cooled milk add excess of dilute sodium hydroxide solution and a few drops of 1 % copper sulphate solution. A violet colour indicates that proteins are present (biuret test). Starch. To a few drops of the starch suspension add a little iodine solution and note the indigo colour. Olive oil. There is no simple and safe test for this, other than smearing a few drops onto paper and noting the translucent greasy mark.

Repeat, but this time fill the tube with air blown in from the lungs at the end of an expiration during which the nose is held closed. This is done by filling the tube with water and closing the end with the thumb. Put this end under the water of the beaker and remove the thumb. 39 A PRACTICAL COURSE IN BIOLOGY The tube is now inverted, full of water and standing in a beaker of water. Insert the end of a bent piece of glass tubing into the open end of the graduated tube and blow the air from the mouth down the bent tube.

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