• Blood: The River of Life [ Kids/Teens/Mature Teens ] - Thinkquest site provides detailed information with graphics and concise explanation about the workings of the human blood and the circulatory system. Includes safety tips to follow at home as well as interactive forums.
• Circulatory System [ Kids/Teens ] - Multiple-choice quiz with crossword puzzle.
• Habits of the Heart [ Teens/Mature Teens ] - Explore the heart and lungs through online science activities.
• The Heart: An Online Exploration [ Teens ] - From the Science Learning Network, visitors will learn about the heart, blood vessels, circulatory system development, cardiovascular health, and a history of heart medicine.
• The Heart and Circulation [ Teens/Mature Teens ] - A well illustrated interactive educational resource about the heart and heart disease. Includes a quiz.
• HeartPoint [ Teens/Mature Teens ] - A multimedia site, showing animations of what different behaviors and lifestyles will do to one's circulatory system. Offers health tips and food recommendations.
• How the Heart Works: The Heart House [ Teens ] - From the Children's Heart Institute, a diagram comparing a heart to a house.
• NOVA Online: Electric Heart [ Teens/Mature Teens ] - This is the story of a handful of brilliant, obsessed surgeons and researchers who pursued the target of a practical artificial heart for decades. Includes heart facts, an overview of a heart transplant, and artificial heart technology.
• Sail the Circulatory System [ Teens ] - ToxRAP offers an interactive educational demonstration on hemoglobin and the carriage of oxygen throughout the body.
• Thinkquest: Blood [ Teens/Mature Teens ] - Information about blood diseases and blood types.
• To Heal A Heart [ Teens/Mature Teens ] - A PBS program about preventing heart disease. Includes frequently asked questions, an overview of heart disease, risk factors, pet scans, lesson plans, and a bibliography.
• Virtual Body [ Kids/Teens/Mature Teens ] - Information on the heart, brain, skeleton, and digestive system. Includes some animations.

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