Describe/ explain how blood circulation in mammals take place.

Answer:

-Deoxygenated blood from the body tissues; enters the right atrium/ auricle; through vena cava; the right atrium contracts; pumping blood into the right ventricle; through tricuspid valve; which prevent the back flow of blood; the right ventricle contracts; pumping blood into the lungs; through pulmonary artery; and semi-lunar valve; for oxygenation; oxygenated blood from the lungs enter into the left atrium/ auricle; through pulmonary vein; the left atrium pumps blood into the left ventricle; through bicuspid valve; which prevents back flow of blood. The left ventricle contracts pumping blood to all parts of the body; through aorta; and semi-lunar valve;

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