By Edited: Sumita Dasgupta
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Additional resources for Environmental Education - A Book of Activities
Wide. • Making bile, a digestive juice. • Some of the bile fluid made in the liver is stored in the gall bladder. • If levels of blood sugar are too low, changing body starch back into blood sugar and releasing it. • Breaking apart old, dead, wornout red blood cells. Alcohol is a toxins thatthe liver breaks down and makes harmless. Too much alcohol can overload the liver and cause a serious disease called cirrhosis. 6 fl. oz. of bile. • After a meal, bile pours from the liver along the main bile duct, and from the gall bladder along the cystic duct into the small intestine.
When a body part is active, changes occur in the blood vessels in order to supply it with more blood. • The muscles in the walls of the small blood vessels, called arterioles, relax. • This allows more blood to flow through them to the part they supply. • The width of the arterioles is controlled mainly by signals from the brain sent along nerves. • The hormone adrenaline also affects the width of the arterioles. • Also, most women naturally have less muscle tissue than men, which has more blood supply compared to other body parts.
Mandible • See pages 12–13 for information on muscles. • It can bend up as a lump of food is pushed to the back of the mouth for swallowing. PARTS OF A TOOTH FA C T S Enamel Dentine Slightly softer but still tough layer under the enamel of the crown and forming the outer layer of the root. 08 in. thick. Crown The part of the tooth above the gum. Dental pulp Soft innermost layer of the tooth, made mainly of blood vessels and nerve ends. Neck Where the gum folds in and down around the tooth at the gum surface.
Environmental Education - A Book of Activities by Edited: Sumita Dasgupta