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Describe the circulation of blood through the heart and explain how the cardiac cycle is controlled.
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- Words:
- 1318
- Submitted:
- Mon Jun 19 2006
... Access Biology Describe the circulation of blood through the heart and explain how the cardiac cycle is controlled. The blood circulatory system is responsible for providing a continuous flow of blood throughout the body to provide oxygen and nutrients to the tissues and remove the waste products and carbon dioxide. The circulatory system also acts as a means of transport for hormones and antibodies, and serves to distribute heat. The heart is the pump which tirelessly carries out the task of moving the blood around the body, beating at about 60 times a minute for an entire lifetime. It takes approximately one minute for blood to circulate from the heart, around the body and back again. The heart consists of four chambers, two atria (labelled auricles on diagram) and two ventricles, and is mainly composed of muscle. It is lined with a thin layer of cells called the Endocardium, and is enclosed
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