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The Human Cardiac Cycle
Member rating: No Rating | Words: | Submitted: Thu Jul 11 2002
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The Human Cardiac Cycle Organisms require a transport system for several reasons. As the organism gets larger, so the transport system becomes more complex in order to fulfil its requirements. The surface area to volume ratio becomes smaller to the point where a long-distance transport system is required in order to move substances more rapidly. These systems have two primary functions: to link the interior of the organism with the outside world and to link each cell and organ of the organism to each other. Humans are fairly large mammals and so they naturally have a more intricate transport system. The type of system in a human is known as a closed vascular circulatory system. It involves pumping blood around the body at sustained high pressure which eventually flows back to the heart. The heart is the organ that pumps blood around the body. The transport in humans is also known...
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