Veterinary heart blood flow diagram quiz1/30/2024 ![]() ![]() There is one atrium and one ventricle on the right side and one atrium and one ventricle on the left side. In humans, the heart is about the size of a clenched fist it is divided into four chambers: two atria and two ventricles. The heart is asymmetrical, with the left side being larger than the right side, correlating with the different sizes of the pulmonary and systemic circuits ( Figure 3.7). The heart is a complex muscle that consists of two pumps: one that pumps blood through pulmonary circulation to the lungs, and the other that pumps blood through systemic circulation to the rest of the body’s tissues (and the heart itself). Open circulatory systems are found in invertebrate animals in which the circulatory fluid bathes the internal organs directly even though it may be moved about with a pumping heart. Blood circulates inside blood vessels and circulates unidirectionally from the heart around one of two circulatory routes, then returns to the heart again this is a closed circulatory system. In all vertebrate organisms this is a closed-loop system, in which the blood is largely separated from the body’s other extracellular fluid compartment, the interstitial fluid, which is the fluid bathing the cells. The circulatory system is a network of vessels-the arteries, veins, and capillaries-and a pump, the heart. ![]()
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