EVERYDAY SCIENCE

Detailed explanation-1: -Arthropods possess an open circulatory system consisting of a dorsal heart and a system of arteries that may be very limited (as in insects) or extensive (as in crabs). The arteries deliver blood into tissue spaces (hemocoels), from which it eventually drains back to a large pericardial sinus surrounding the heart.

Detailed explanation-2: -An open circulatory system, found in arthropods, pumps blood into a cavity called a hemocoel where it surrounds the organs and then returns to the heart(s) through ostia (openings). The blood found in arthropods, a mix of blood and interstitial fluid, is called hemolymph.

Detailed explanation-3: -Hemolymph enters the heart when it’s relaxed. The heart then contracts and pumps the hemolymph through the vessel toward the insect’s head. There hemolymph exits the vessel to flow back through the body cavity, coming into contact with all tissues and organs.

Detailed explanation-4: -Final answer: The correct statement about the circulatory system in animals is blood circulation occurs in closed vessels in arthropods.