EVERYDAY SCIENCE

Detailed explanation-1: -In an open circulatory system, the blood is not enclosed in the blood vessels but is pumped into a cavity called a hemocoel and is called hemolymph because the blood mixes with the interstitial fluid.

Detailed explanation-2: -The open circulatory system, on the other hand, is most commonly seen in invertebrates such as cockroaches and crabs. The hemolymph directly bathes the organs and tissues. The blood circulates within closed vessels. The blood and interstitial fluid cannot be distinguished.

Detailed explanation-3: -(b) In open circulatory systems, a fluid called hemolymph is pumped through a blood vessel that empties into the body cavity. Hemolymph returns to the blood vessel through openings called ostia. Arthropods, such as this bee and most mollusks, have open circulatory systems.

Detailed explanation-4: -The open circulatory system has no blood vessels, and therefore, the blood flows through the general body cavity; thus, there is no much energy that is required to operate and maintain it.

Detailed explanation-5: -The open circulatory system has blood and interstitial fluid mixed called hemolymph that flows freely within the body cavity called hemocoel. Approximately 90% of the hemolymph is composed of amino acids, sugars, proteins, inorganic ions, etc., and 10% contains hemocytes.