By Inc. Encyclopaedia Britannica
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Extra info for Britannica Illustrated Science Library Human Body I
Sample text
The purpose of this is to prevent the escape of heat; as a consequence, the hairs stand on end, resulting in what is commonly called goose bumps. The opposite happens in response to heat: the HAIR STANDING ON END This is caused by muscular contraction and guided by the open pore. CONTRACTED VESSEL A EPIDERMIS Impermeable to water. It is external and is the thinnest layer. It is wear-resistant. blood vessels dilate because the skin has received instructions from the brain to dissipate heat, and the vessels emit heat as if they were radiators.
4 10 inches (25 cm) IS THE LENGTH OF THE ESOPHAGUS. 6 52 INTERNAL SYSTEMS AND ORGANS HUMAN BODY I 53 Stomach he part of the digestive tract that is a continuation of the esophagus. It is sometimes thought of as an expansion of the esophagus. It is the first section of the digestive system that is located in the abdomen. ” In the stomach, gastric juices and enzymes subject the swallowed food to intense chemical reactions while mixing it completely. The stomach connects with the duodenum through the pylorus.
IMAGE 2 The images from both eyes come together, and the brain reflects the object at a right angle. IMAGE 3 The perception of the right eye completes the binocular arc of 120°. This condition makes it difficult to see objects that are close to us. It happens when the image is focused behind the retina. It can be corrected by convex (converging) lenses, which make the rays of light strike the retina properly. B MYOPIA (NEARSIGHTEDNESS) C COLOR BLINDNESS Here the image is formed in front of the retina.