13+ Comparative Anatomy Heart. The heart is a hollow muscular organ that rythmically contracts and relaxes. Heart, arteries, veins and blood capillaries are included in the circulatory system.
The heart is a hollow muscular organ that rythmically contracts and relaxes. Comparative anatomy of heart structure. The heart has two receiving chambers, and two pumping chambers.
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The heart is a hollow muscular organ that rythmically contracts and relaxes. Located between the lungs in the middle of the chest, the heart pumps blood through the network of arteries and veins. It is on the ventral side of the alimentary canal heart is a pumping organ of blood. It is divided by a partition (or septum) into two halves.