what are the four parts of the heart called?Advertisement
The human heart is an organ that provides a continuous blood circulation through the cardiac cycle and is a vital organ in the human body. The heart is divided into four main chambers: the two upper chambers are called the left atrium and the right atrium (plural atria) and the two lower ... - read more
The heart is a hollow muscular organ that pumps blood throughout the blood vessels to various parts of the body by repeated, rhythmic contractions. It is found in all animals with a circulatory system, which includes the vertebrates. The adjective cardiac means "related to the heart" and comes ... - read more
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