While acting as court physician, Harvey was able to conduct his research in human biology and physiology. Harvey focused much of his research on the mechanics of blood flow in the human body. Most physicians of the time felt that the lungs were responsible for moving the blood around throughout the body. Harvey questioned these beliefs and his questions directed his life-long scientific investigations.
The human circulatory system functions to transport blood and oxygen from the lungs to the various tissues of the body. The heart pumps the blood throughout the body. The lymphatic system is an extension of the human circulatory system that includes cell-mediated and antibody-mediated immune systems.
Aorta: Large elastic artery that carries blood away from the left ventricle and into the systemic circuit
Blood Transfusion: Transfer of blood or blood components into a persons bloodstream.
Circulatory System: System of blood, blood vessels, lympatics, and the heart. It is the circulation of blood and lymph.
Coronary Circulation: supplies blood to the muscles of the heart.
Diastole: When the chamber fills with blood and prepares for the start of the next cardiac cycle.
Plasma: The fluid ground substance of whole blood.
An adult human has an average resting heart rate of about 75 beats per minute, the same rate as an adult sheep.
But a blue whale's heart is about the size of a compact car, and only beats five times per minute. A shrew, on the other hand, has a heart rate of about 1,000 beats per minute.
During the 24 hours after the death of a loved one, a person's risk of having a heart attack increases by about 21 times, the study found.