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biological circulaton

Quick Summary

The circulatory system is a network of tissues, blood vessels, and lymph vessels that transports nutrients, gases, and waste products throughout an organism. This system allows for the integration of various tissues and includes the intake, transport, and removal of metabolic materials.

Invertebrates exhibit diverse circulatory fluids and methods, with many having open systems where fluid circulates freely. Vertebrates, however, possess closed systems with blood and lymph circulating through intricate vessels. This system is vital for maintaining homeostasis and supporting organ function.1

The circulatory system relies on a pump, typically a heart, to propel blood. In vertebrates, the heart is a specialized, chambered muscular pump. Blood flows from the heart through arteries to capillaries, where exchange with tissues occurs, and then returns via veins. This continuous flow ensures that cells receive necessary substances and waste products are removed.234

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