Chapter 23 The Circulatory, Respiratory, Digestive, and Excretory ...

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Figure 23.30: Nutrition facts labels like this one can help you make good food choices. estimate of the fat content of the body. It is calculated by dividing a person’s weight (in kilograms) by the square of the person’s height (in meters). Obesity increases the risk of health problems such as type 2 diabetes and hypertension. Eating Disorders Some people who are obese have an eating disorder, called binge eating disorder, in which they compulsively overeat. An eating disorder is a mental illness in which people feel compelled to eat in a way that causes physical, mental, and emotional health problems. Other eating disorders include anorexia nervosa and bulimia nervosa. Treatments for eating disorders include counseling and medication. Lesson Summary • The digestive system consists of organs that break down food, absorb nutrients, and eliminate waste. The breakdown of food occurs in the process of digestion. • Digestion consists of mechanical and chemical digestion. Mechanical digestion occurs in the mouth and stomach. Chemical digestion occurs mainly in the small intestine. The pancreas and liver secrete fluids that aid in digestion. • Virtually all absorption of nutrients takes place in the small intestine, which has a very large inner surface area because it is covered with millions of microscopic villi. • The absorption of water from digestive wastes and the elimination of the remaining solid wastes occur in the large intestine. The large intestine also contains helpful bacteria. • Digestive system diseases include food allergies, ulcers, and heartburn. • Nutrients are substances that the body needs for energy, building materials, and control of body processes. Carbohydrates, proteins, lipids, and water are nutrients needed in relatively large amounts. Vitamins and minerals are nutrients needed in much smaller amounts. • Balanced eating promotes good health. MyPyramid and food labels are two tools that can help you choose the right foods for balanced eating. Eating too much and exercising too little can lead to weight gain and obesity. Some people who are obese have an eating disorder. Eating disorders are mental illnesses that require treatment by health professionals. www.ck12.org 718
Interactive Puzzles Figure 23.31: (Watch Remote Swf Video) http://www.ck12.org/flexbook/embed/view/225 Figure 23.32: (Watch Remote Swf Video) http://www.ck12.org/flexbook/embed/view/226 Figure 23.33: (Watch Remote Swf Video) http://www.ck12.org/flexbook/embed/view/227 719 www.ck12.org
Page 1 and 2: Chapter 23 The Circulatory, Respira
Page 3 and 4: Figure 23.1: The function of the ci
Page 5 and 6: • Arteries are muscular blood ves
Page 7 and 8: Figure 23.6: The systemic circulati
Page 9 and 10: Blood Blood is a fluid connective t
Page 11 and 12: • Blood is a fluid connective tis
Page 13 and 14: Figure 23.12: (Watch Youtube Video)
Page 15 and 16: Figure 23.14: Alveoli are tiny sacs
Page 17 and 18: • Pneumonia is a disease in which
Page 19 and 20: Apply Concepts 6. Sometimes people
Page 21 and 22: Figure 23.18: The digestive system
Page 23 and 24: The following interactive animation
Page 25 and 26: Table 23.1: (continued) Enzyme What
Page 27 and 28: • Food allergies occur when the i
Page 29 and 30: Table 23.3: (continued) Vitamin Fun
Page 34 and 35: Lesson Review Questions Recall 1. W
Page 36 and 37: Figure 23.34: The kidneys are the c
Page 38 and 39: Figure 23.38: The parts of a nephro
Page 40 and 41: 2. List organs of the excretory sys

Chapter 23 The Circulatory, Respiratory, Digestive, and Excretory ...

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