Download Human Biology. A Text Book of Human Anatomy, Physiology and by C. J. Wallis (Auth.) PDF

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By C. J. Wallis (Auth.)

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Extra resources for Human Biology. A Text Book of Human Anatomy, Physiology and Hygiene

Example text

Regulation of body temperature—This is brought about by sweating and by the position of the hair. The hair encloses a belt of air which has an insulating effect. However, the latter method is not of much importance in the human being as it is restricted to certain parts of the body—the head, the axilla, the pubic region and in man also the face and chest. It is, of course, particularly abundant on the head where there may be 200 to 300 hairs per sq. cm. When the hair is erect it exposes a greater surface of the skin enabling heat to be lost.

A substance called marrow is found in these spaces. It also occurs in the centre or medullary cavity of the long bones. This yellow marrow consists mostly of fat whereas the red marrow found in the spongy bone at the ends of the long bones and elsewhere CANCELLOUS BONE ARTICULAR CARTILAGE PERIOSTEUM MEDULLARY CAVITY CANCELLOUS BONE Fig. 1. Longitudinal section through a long bone. 25 26 HUMAN BIOLOGY has a much lower fat content and is rich in red blood corpuscles. It is here, in fact that the red and some of the white cells of the blood originate.

LATERAL PROCESS CAPITULAR DEMI-FACET SPINOUS PROCESS Fig. 13. Thoracic vertebra. A. From above. B. Side view. THE SKELETAL SYSTEM 37 Lumbar region—These vertebrae are much larger than those in any other region. They have square spinous processes and rather slender transverse processes. Fig. 14. Lumbar vertebra. A. From above. B. Side view. Fig. 15. Sacrum and coccyx. HUMAN BIOLOGY 38 , -J&Qt 1 CERVICAL 2 ^M ^ f e 43 ^m CERVICAL FLEXURE J0m 7t _ (j^i^ ^S^gS 5§P? I THORACIC 2 ^P? 5 J^^^^ SACRAL FLEXURE frliftr'^ ^ ^ SACRUM The Sacrum—This is a wedge-shaped bone which articulates with the ilium or hip bone of the pelvic girdle on each side.

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