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Assignment 01 "The Heart" From the moment it begins beating until the moment it stops, the heart works tirelessly. Like a pumping machine, the heart provides the power needed for life. The mouse has a closed circulatory system, and a complex heart. Unlike, fish, amphibians and reptiles the mouse has a four chambered heart (two hearts in one - Permanently separated pulmonary and systemic circuits). The hearts one and only function is to continuously pump blood through the body. The heart accomplishes this by continuously pumping blood; deoxygenated blood enters the heart from the superior/inferior vena cava, these large veins empty into the right atrium. Blood then flows through an atrioventricular valve [valves prevent back flow] into the right ventricle. The right ventricle pumps this blood into the pulmonary circuit [primarily the lungs which expels out CO2 and absorbs O2]. The oxygenated blood is returned to the left atrium,...

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