ࡱ> uwt $bjbjjj gcgcT>>eeeTm|u02>-$.Dh.$///////$1]40e.*>-..0/0///. e//.///%@/m.j//E00u0/4/L4/4e/H../.....00L/L...u0....4.........> K: Name Date Class   LESSON 3 The Excretory System Directions: Each of the following statements is false. Replace the underlined word(s) to make the statement true by using a term from the list below. Write your changes on the lines provided. NOTE: You may need to change a term to its plural form. area bladder excretory system kidney nephron ureter urethra urine 1. Urine is stored in a muscular sac called the ureter. 2. A bean-shaped organ called the bladder filters wastes from the blood. 3. Urine leaves the kidneys through the urethra. 4. Some wastes exit the body in a fluid called area. 5. The organs of the digestive system regulate fluid levels and eliminate wastes from the body. 6. The actual filtration of blood occurs within the millions of ureters in the kidneys. 7. Urine leaves the bladder through a duct called the excretory system. 8. Each nephron of the excretory system has a function. 48 Digestion and Excretion Name Date Class   LESSON 3 The Excretory System A. Functions of the Excretory System 1. The collects and eliminates wastes from the body and regulates the level of fluid in the body. 2. If body is not eliminated, it could become toxic and damage organs. 3. The excretory system controls how much water leaves the body through . 4. The organs of the system collect and remove undigested solids from food. 5. The system processes, transports, collects, and removes liquid waste from the body. 6. The system, which includes the skin, secretes excess salt and water through sweat glands. B. Organs of the Urinary System 1. The is a bean-shaped organ that filters wastes from blood. 2. are networks of capillaries and tubules in the kidneys, where filtration of blood occurs. 3. When kidneys filter blood plasma, they produce a fluid called . 4. Urine leaves each kidney through a tube called the . 5. Both ureters drain into the . It is a muscular sac that holds urine until the urine is . 6. Urine leaves the bladder through a tube called the . 7. The urethra contains circular muscles called that control the release of urine. C. Urinary Disorders 1. A urinary disorder is an illness that affects one or more of the urinary system. 2. Common urinary disorders include kidney disease, urinary tract infection, kidney , and bladder control problems. Digestion and Excretion 49 Name Date Class Lesson Outline continued D. The Excretory System and Homeostasis 1. The excretory system helps maintain in two ways. It filters wastes from the and removes wastes from the system. 2. A hormone controlled by the causes the tubules in the kidney to absorb more water from the blood. This helps the body regulate . 50 Digestion and Excretion Name Date Class   LESSON 3 The Excretory System Directions: On each line, write the term from the word bank that correctly completes each sentence. Each term is used only once. blood excretory integumentary liquid nephrons respiratory solids ureter urethra urinary urine water 1. The system collects and eliminates wastes from the body. 2. The excretory system controls how much is eliminated from the body. 3. The organs of the digestive system remove undigested , whereas the urinary system removes waste. 4. The system removes carbon dioxide and water vapor from the body. 5. The system secretes excess salt and water through sweat glands. 6. The system includes two kidneys, two ureters, the bladder, and the urethra. 7. The kidneys remove wastes from . 8. Networks of capillaries and small tubes in the kidneys are called . 9. When blood is filtered, is produced. 10. Urine leaves each kidney through a tube called the . 11. The bladder is an organ that holds urine until it is excreted through the . 52 Digestion and Excretion Name Date Class   LESSON 3 Refueling with Sports Drinks Glucose-electrolyte beveragesmore commonly known as sports drinkswere first used by athletes to replace body fluids lost in sweat during exercise. The popularity of these drinks has grown steadily. Now athletes and nonathletes alike reach for sports drinks to quench their thirst. Manufacturers have responded by producing sports drinks in every shade of the rainbow. The drinks contain a wide variety of ingredients. Which ingredients, if any, are beneficial? What is in a sports drink? The ideal sports drink contains water, carbohydrates, and electrolytes, such as sodium, potassium, and phosphate. Carbohydrates are complex sugars; they make the drink taste pleasant and provide energy. Sports drinks that contain between 4 to 8 percent carbohydrates help the body absorb fluids in the most efficient manner. Electrolytes such as sodium replace salts lost through sweating. They increase absorption of sugar and water, and help restore the bodys volume of plasma. They also help the body retain fluid after it is consumed. Water replaces fluids that are lost during exercise. A loss of body fluid can affect the hearts performance and lower blood pressure. Dehydration can occur if fluids and salts are lost. Carbohydrates are also lost if exercise continues for more than one hour. Signs of dehydration include the following: Thirst Loss of appetite Lethargy Anxiety Nausea and dizziness Irritability Cramps Fatigue Headache Dark urine Who needs sports drinks? People who exercise for less than 30 minutes at a time can replace lost body fluids with an inexpensive, readily available alternative to sports drinks water. At this level of exercise, fluid replacement is more important than energy replacement. However, sports drinks are excellent choices for athletes and exercisers who need water for hydration and carbohydrates for energy. In the end, people make their choices based on personal tastes. Regardless of whether you take leisurely walks or run marathon races, it is important to consume adequate amounts of fluid to maintain the proper level of fluids in your body. Applying Critical-Thinking Skills Directions: Answer each question or respond to each statement. 1. Infer From a health perspective, why is it important that a sports drink have a pleasant taste? 2. Relate Which beverage best fits your level of exercisesports drinks or water? Explain. Digestion and Excretion 59 Name Date Class   LESSON 3 The Excretory System Multiple Choice Directions: On the line before each question, write the letter of the correct answer. 1. Which function is characteristic of the excretory system? A. provides energy B. eliminates waste C. breaks down food 2. Which body system works with the excretory system to regulate fluid levels in the body? A. nervous system B. immune system C. reproductive system Matching Directions: On the line before each definition, write the letter of the term that matches it correctly. 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