Final answer:
The internal anatomy of the heart includes four valves: the aortic valve, pulmonary valve, tricuspid valve, and mitral valve. These valves help to regulate the flow of blood through the heart.
Step-by-step explanation:
The internal anatomy of the heart includes several structures, including the valves. The valves of the heart ensure unidirectional blood flow by opening and closing as the heart contracts and relaxes. There are four valves in the heart: the aortic valve, the pulmonary valve, the tricuspid valve, and the mitral valve. Each valve has a specific location and function in controlling the flow of blood through the heart.