EVERYDAY SCIENCE

Detailed explanation-1: -In contrast to a closed system, arthropods (including insects, crustaceans, and most mollusks) have an open circulatory system. In an open circulatory system, the blood is not enclosed in the blood vessels, but is pumped into a cavity called a hemocoel.

Detailed explanation-2: -Mollusks possess an open circulatory system in which body fluid (hemolymph) is transported largely within sinuses devoid of distinct epithelial walls.

Detailed explanation-3: -Open circulatory system: It is primarily found in invertebrates. Here, the blood flows freely through cavities since there are no vessels to conduct the blood. Closed circulatory system: It is found in vertebrates and a few invertebrates, like earthworms. This system has vessels that conduct blood throughout the body.

Detailed explanation-4: -Phylum Arthropoda and phylum Mollusca have an open circulatory system where the internal organs are bathed in the blood. Cephalopods in molluscs are an exception as they have a closed circulatory system.

Detailed explanation-5: -As opposed to a closed system, arthropods– including insects, crustaceans, and most mollusks– have an ‘open’ circulatory system.