National Cancer Institute at the National Institutes of Health
Seer Training Modules: Introduction to the Cardiovascular System
Self-guided learning activity where students learn about the structure and function of the human cardiovascular system. There is a short quiz at the end of the lesson to check for understanding.
Curated OER
Kids Health: Your Multi Talented Muscles
At this site you will learn what muscles are made up of and find out about the different types of muscles in the body. A great illustration of a skeletal muscle is also provided. Available in Spanish.
Curated OER
Kids Health: Muscles
If you've ever wondered how your muscles work, this movie and activity guide has the answer! [6:49]
Sophia Learning
Sophia: Heart and Blood Flow
This lesson will identify the major structures of the heart and their specific roles in the overall functioning of the heart.