Excretory System
The excretory system is responsible for removing waste products from the body. It consists of several organs, including the kidneys, ureters, bladder, and urethra.
Organs of the Excretory System
- Kidneys: The kidneys filter the blood to remove waste products and excess substances, producing urine as a result.
- Ureters: The ureters are tubes that carry urine from the kidneys to the bladder.
- Bladder: The bladder stores urine until it is expelled from the body.
- Urethra: The urethra is the tube through which urine passes from the bladder out of the body.
Functions of the Excretory System
The excretory system performs several important functions:
- Waste Removal: It eliminates waste products such as urea, ammonia, and excess salts from the body.
- Regulation of Water and Electrolyte Balance: The excretory system helps maintain the balance of water, salts, and other electrolytes in the body.
- Acid-Base Balance: It regulates the pH level of the blood by excreting hydrogen ions and reabsorbing bicarbonate ions.
- Regulation of Blood Pressure: The excretory system helps regulate blood pressure by controlling the volume of blood and the concentration of electrolytes in the blood.
Disorders of the Excretory System
Disorders of the excretory system can lead to various health problems, including kidney stones, urinary tract infections, and kidney failure. It is important to maintain a healthy lifestyle, drink an adequate amount of water, and seek medical attention if any symptoms of excretory system disorders are present.
Study Guide
Use the following study guide to review the excretory system:
- Describe the functions of the excretory system.
- List the organs of the excretory system and their roles.
- Explain the process of urine formation in the kidneys.
- Discuss the importance of maintaining a healthy excretory system.
- Identify and describe common disorders of the excretory system.
Remember to review the functions, organs, and disorders of the excretory system to ensure a comprehensive understanding of this important bodily system.
.◂Science Worksheets and Study Guides Fourth Grade. Classifying organisms
Study Guide
Classifying organisms 
Worksheet/Answer key
Classifying organisms Worksheet/Answer key
Classifying organisms Worksheet/Answer key
Classifying organisms Vocabulary/Answer key
Classifying organisms Vocabulary/Answer key
Classifying organisms Vocabulary/Answer key
Classifying organisms Vocabulary/Answer key
Classifying organisms
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
The Living Environment: Students understand that cells are the basic unit of life, that all life as we know it has evolved through genetic transfer and natural selection to create a great diversity of organisms, and that these organisms create interdependent webs through which matter and energy flow. Students understand similarities and differences between humans and other organisms and the interconnections of these interdependent webs.
Biodiversity: Students compare living things based on their behaviors, external features, and environmental needs.
Describe how living things can be sorted in many ways, depending on which features or behaviors are used to sort them, and apply this understanding to sort living things.