A circulatory system that keeps blood confined within vessels after leaving the heart is referred to as:

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A closed circulatory system is defined as a circulatory system where the blood is always enclosed within vessels, as opposed to an open circulatory system where blood is pumped into open spaces called sinuses. In a closed circulatory system, the heart pumps blood through a system of vessels that branch out to organs and tissues throughout the body, delivering oxygen and nutrients and removing waste products.

A Circulatory System That Keeps Blood Confined Within Vessels After