Blood
Blood is a specialized bodily fluid that is essential for transporting nutrients, oxygen, and waste products throughout the body. It also plays a crucial role in maintaining the body's temperature and pH balance, as well as protecting against infections and diseases.
Composition of Blood
- Plasma: Makes up about 55% of the total blood volume and is a pale yellow fluid that contains water, electrolytes, proteins, hormones, and waste products.
- Red Blood Cells (Erythrocytes): Responsible for carrying oxygen to the body's tissues and removing carbon dioxide. They make up about 45% of the blood volume.
- White Blood Cells (Leukocytes): Part of the body's immune system and help fight off infections and diseases. They make up a small percentage of the total blood volume.
- Platelets: Cell fragments that play a key role in blood clotting and preventing excessive bleeding.
Functions of Blood
Blood performs several important functions in the body, including:
- Transportation: Carries nutrients, oxygen, hormones, and waste products to and from the body's cells.
- Regulation: Helps regulate body temperature, pH balance, and fluid balance within the body.
- Protection: Contains white blood cells that defend against infections and platelets that aid in blood clotting to prevent excessive bleeding.
Study Guide
Here are some key points to remember when studying the topic of blood:
- What are the main components of blood?
- What is the function of red blood cells?
- How do white blood cells contribute to the body's immune system?
- Explain the role of platelets in blood clotting.
- Discuss the functions of blood in the body.
Understanding the composition and functions of blood is essential for grasping the importance of this vital bodily fluid in maintaining overall health and well-being.
.◂Science Worksheets and Study Guides Third Grade. Animals and their needs
Study Guide
Animals and their needs 
Worksheet/Answer key
Animals and their needs Worksheet/Answer key
Animals and their needs Worksheet/Answer key
Animals and their needs Vocabulary/Answer key
Animals and their needs
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
LIFE SCIENCE
From Molecules to Organisms: Structures and Processes
Create representations to explain the unique and diverse life cycles of organisms other than humans (e.g., flowering plants, frogs, butterflies), including commonalities such as birth, growth, reproduction, and death.
Unity and Diversity
Construct an argument from evidence to explain the likelihood of an organism’s ability to survive when compared to the resources in a certain habitat (e.g., freshwater organisms survive well, less well, or not at all in saltwater; desert organisms survive well, less well, or not at all in woodlands).
Create models that illustrate how organisms and their habitats make up a system in which the parts depend on each other.