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# The Excretory System ## Lesson 3: Focus Question - Can Exercise Affect the Excretory System? **Parts of the Excretory System:** As you breathe, eat, walk, study, and sleep, your body collects wastes. These wastes include toxins, waste products, and carbon dioxide. These result from metabolic fu...

# The Excretory System ## Lesson 3: Focus Question - Can Exercise Affect the Excretory System? **Parts of the Excretory System:** As you breathe, eat, walk, study, and sleep, your body collects wastes. These wastes include toxins, waste products, and carbon dioxide. These result from metabolic functions occurring constantly in the body. The excretory system removes these wastes from the body. It also regulates the amount of fluid and salts in the body, and maintains the pH of the blood. All of these functions help maintain homeostasis. The components of the excretory system include: * Lungs * Skin * Kidneys * Ureters * Bladder * Urethra **Figure 17:** The organs of excretion work together to eliminate wastes from the body. These organs include the lungs, skin, and kidneys. * **Lungs:** Primarily excrete carbon dioxide. * **Skin:** Primarily excretes water and salts (in sweat). * **Kidneys:** The major excretory organs in the body. They filter wastes and other substances from the blood. The ureters carry urine produced from the kidneys to the bladder. Urine exits the body through the urethra. **Get It?:** Identify the components of the excretory system. **Activities:** * **BioLab (Internet):** Make Positive Health Choices. Plan and carry out an investigation to determine how lifestyle choices affect the function of the circulatory, respiratory, and excretory systems. * **3D Thinking Activity:** Use your Science Journal to record evidence as you complete readings and activities in this lesson.