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. Fossils and extinct animals
Study Guide
Fossils and extinct animals 
Worksheet/Answer key
Fossils and extinct animals Worksheet/Answer key
Fossils and extinct animals Worksheet/Answer key
Fossils and extinct animals Vocabulary/Answer key
Fossils and extinct animals Vocabulary/Answer key
Fossils and extinct animals Vocabulary/Answer key
Fossils and extinct animals Vocabulary/Answer key
Fossils and extinct animals
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
Concepts of Life Science (SC1, SC2, SC3)
The student demonstrates an understanding of how science explains changes in life forms over time, including genetics, heredity, the process of natural selection and biological evolution by describing fossil evidence (e.g., casts, track ways, imprints, etc.) of extinct organisms.