PATHOLOGY

Detailed explanation-1: -Humans have a closed circulatory system. The blood is enclosed in the vessels and the heart while circulating. The blood travels through arteries and veins and carries important molecules throughout the body.

Detailed explanation-2: -Open circulatory systems are systems where blood, rather than being sealed tight in arteries and veins, suffuses the body and may be directly open to the environment at places such as the digestive tract. Open circulatory systems use hemolymph instead of blood.

Detailed explanation-3: -An open circulatory system is one in which there is a mixing of the blood and interstitial to make up the hemolymph. In an open circulatory system, the blood is not enclosed in blood vessels. It is pumped into a cavity called the hemocoel.