Vitamin K
Vitamin K is a fat-soluble vitamin that is essential for blood clotting and bone health. There are two main forms of vitamin K: K1 (phylloquinone) and K2 (menaquinone).
Sources of Vitamin K
Vitamin K1 is found in green leafy vegetables such as spinach, kale, and broccoli. Vitamin K2 is produced by bacteria in the gut and is also found in fermented foods like cheese and natto.
Functions of Vitamin K
Vitamin K is necessary for the production of certain proteins that help with blood clotting. It also plays a role in bone metabolism and may help prevent osteoporosis.
Deficiency and Toxicity
A deficiency in vitamin K can lead to excessive bleeding and easy bruising. However, toxicity from vitamin K is rare as it is not typically found in high amounts in food or supplements.
Study Guide
- What are the two main forms of vitamin K?
- Where is vitamin K1 found?
- What are the functions of vitamin K?
- What are the symptoms of a vitamin K deficiency?
- What are the sources of vitamin K2?
◂Science Worksheets and Study Guides Third Grade. Relationships among living things
Study Guide
Relationships among living things 
Activity Lesson
Relationships Among Living Things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Vocabulary/Answer key
Relationships among living things Vocabulary/Answer key
Relationships among living things
Activity LessonWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/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.