By Richard Walker
Received this booklet for my son who's 10. He was once learning the physique in technological know-how category. nice diagrams and evidence.
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Extra info for Human Body (Dk Guide)
Sample text
White blood cells and platelets— seen here as a thin pale line between plasma and red blood cells—make up less than 1 percent of blood. Red cells, far more numerous than white cells or platelets, make up about 44 percent of blood. 3 t n o ga yc d ll bo s on there are 250 million red cells, 16 million platelets, and only 375,000 white cells. du lt In one drop of blood... This white cell is a lymphocyte—it “remembers” the identity of specific pathogens. If one particular pathogen, such as the measles virus, invades again, lymphocytes launch a high-speed attack against the enemy.
MODEL OF A PEPSIN MOLECULE This indented “active site” of the enzyme is where proteins are attached before being split into smaller molecules. CHEMICAL DIGESTERS Pepsin (left) is an enzyme—chemical digester—contained in the gastric juice that is secreted into the stomach when food arrives. It works rapidly, in the very acidic environment provided by the hydrochloric acid in gastric juice, to break down proteins into smaller molecules called peptides. The hydrochloric acid in gastric juice also destroys bacteria swallowed with food or beverages.
Second, the kidneys extract wastes, particularly urea, that would be harmful if allowed to build up in the blood. The resulting mix of 95 percent water plus dissolved waste is called urine. This is flushed out of the body through the ureters, bladder, and urethra which, with the kidneys, make up the urinary system. The importance of the kidneys is shown by the fact that every four minutes the body’s total blood volume passes through them. S BLOOD CIRCULATES AROUND Ureter carries urine away from kidney.
