EVERYDAY SCIENCE

Detailed explanation-1: -Much like humans, annelids have a closed circulatory system, which means the blood circulates through a closed network of blood vessels. In some cases, such as with polychaete worms, the blood is pumped directly through self-contracting blood vessels.

Detailed explanation-2: -Blood glands produce blood cells and hemoglobin which is dissolved in plasma. Annelids possess a closed circulatory system.

Detailed explanation-3: -Annelids have a closed circulatory system in which blood is pumped along by muscles in blood vessels (Fig. 3.48). Blood flows through the microscopic capillaries, picking up food molecules from the digestive tract and oxygen from the skin and transporting them to the cells of the body.

Detailed explanation-4: -Explanation: Annelida and Coelenterata have closed circulatory systems whereas Arthropods and Mollusca have an open circulatory system.

Detailed explanation-5: -Complete answer: Chordates have a closed circulatory system with a network of blood vessels throughout the body. Most of the chordates have well-defined hearts, but not all. Therefore, this is the incorrect option. Option B: Annelids are characterised with the closed circulatory system.eg: humans.