Essays+chapters+20,+21,+22

Essays chapter 20 Essays chapter 21 Essays chapter 22
 * 1) Name the four major types of body tissues and briefly describe the function of each type.
 * 2) Name the 12 organ systems of a vertebrate. Describe the function of each system in one sentence each.
 * 3) What are the advantages of computerized tomography (CT) over conventional X-rays?
 * 4) Compare a thermostat controlling room temperature with your brain controlling body temperature. Describe the following for each system: stimulus sensor, set point, control center, effector and response.
 * 5) Some animals can “breathe” through their skins, without the aid of lungs or gills, or absorb food and expel wastes through the surfaces of their bodies, without specialized digestive tracts or kidneys. Why are all these animals rather small?
 * 1) Why do many nutrient molecules contained in the food that you eat have to be digested before your body can use them?
 * 2) In a few sentences, compare the digestive system of a grasshopper with that of a human.
 * 3) Describe the substances in saliva and their roles in the function of the digestive tract.
 * 4) Plants are difficult to digest. Describe how the digestive tracts and habits of three different herbivorous mammals are suited to a plant diet.
 * 5) Briefly describe the potential problems with “fad” diets. What is the best approach to healthy, effective weight control?
 * 6) Describe the kinds of information you can get from reading labels on food. How might this information be useful?
 * 1) Compare the advantages and disadvantages of obtaining oxygen from water and obtaining it from the air?
 * 2) How are gills and lungs similar? How are they different?
 * 3) Describe how the structure, number and arrangement of alveoli are well suited to their function in gas exchange.
 * 4) Where are your vocal cords? How do they work? How do they produce high-pitched and low-pitched sounds?
 * 5) When you inhale, does air flow into the lungs causing them to expand? Or do the lungs expand, causing air to flow in? Explain.
 * 6) Explain how countercurrent exchange in a fish gill enhances absorption of oxygen from water.