Answer:
not always confined to blood vessels and is under lower pressure than in closed circulatory systems
Explanation:
In an open circulatory system, blood is not always confined to blood vessels and is under lower pressure than in closed circulatory systems. This is because an open circulatory system is a system where blood, may be directly open to the environment in various places throughout the body such as the digestive tract, as opposed to being sealed in arteries and veins. Such a system is mostly found in insects and some animals such as snails or clams.
Blood is not always confined to blood vessels and is under lower pressure than in closed circulatory systems in an open circulatory systems.
In an open circulatory system, blood is pumped into a cavity called a hemocoel rather than being encased in blood vessels. Because it combines with the interstitial fluid, blood is referred to as hemolymph.
Open circulatory systems are those in which blood suffuses the body rather than being sealed tight in arteries and veins, and may be immediately exposed to the environment in locations such as the digestive tract.
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