Merck Sharp & Dohme Corp.
Merck Manual: Biology of the Heart
The Merck Manual describes the human heart and shows how the heart pumps blood. Includes interactive 3D models.
PBS
Pbs Learning Media: Amazing Heart Facts
This feature from the NOVA: "Cut to the Heart" highlights facts about the heart, including its size and placement, and will help you to understand the importance of this wondrous organ in our bodies.
Other
Danil Hammoudi, Md: Anatomy and Physiology Course
This page has complete course material for a beginning human anatomy course and everything can be downloaded. There are readings and presentations on all the major systems and organs of the human body, with lots of detailed, labeled...
Gateway Community College
James Crimando: Cardiovascular System
Learn the anatomy of the human cardiovascular system.