An introduction to the structure and function of the human circulatory system, explaining how the heart works to pump blood to the rest of the body, what the blood is made of, why there are different types of blood, and what the heart looks like.
An introduction to the structure and function of the human circulatory system, explaining how the heart works to pump blood to the rest of the body, what the blood is made of, why there are different types of blood, and what the heart looks like.
