Human Biology. Made Simple by Robert Barrass (Auth.)

By Robert Barrass (Auth.)

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14. Fore-limbs of vertebrates: (A) fore-leg of a frog Rana; (B)flipperof a turtle Chelone; (C) wing of a bird Columba; and (D) arm of a man Homo (drawings not to same scale). The species in a genus are so much alike because they are descended from the same ancestral stock. The genera in a family are more distantly related; the families in an order are even more distantly related; and so on. EvidencefromGeographical Distribution There are different species of the genus Canis in different parts of the world (see pp.

The lenses of the condenser, objective and eyepiece of the microscope should be cleaned with lens tissue to remove any dust. 39 40 Human Biology 1. Place the lamp 20 cm away from the mirror, and use the flat side of the mirror to reflect light through the microscope. 2. Adjust the microscope so that the revolving nosepiece can be rotated without touching the stage. 3. The low-power objective should be in position immediately below the tube (as in Fig. 16). Fig. 16. Parts of a compound microscope: (A) microscope with a tube that moves up and down for focusing; (B) a microscope with a stage that moves for focusing and with built-in illumination.

In studying different forms of life and the structure and functioning of organisms and their parts, the biologist must always be aware of the relation­ ship between size and surface area. Because it is so small, each bacterium has a very large surface area in proportion to its volume. To help you to understand this, compare the surface area and volume of cubes of different dimensions: Ratio Surface area Volume surface: volume 2 cm cube 24 cm2 8 cm3 3:1 2 1 cm cube 6 cm 1cm 3 6:1 The smaller the organism, the shorter the distance from its centre to the outside and the larger its surface area in proportion to its volume.

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