What type of circulatory system is found in arthropods?
Arthropods have an open circulatory system, where blood directly bathes tissues and organs.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Mollusca and Echinodermata
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Which phylum includes animals with an open circulatory system?
Arthropods have an open circulatory system where the blood directly bathes organs in a hemocoel.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Arthropoda
Open circulatory system is seen in
Open circulatory system characterized by heart pumping hemolymph through short open-ended arteries into large interconnected sinuses forming hemocoel where hemolymph directly bathes tissues without continuous endothelial separation, mixing blood and interstitial fluid, returning to dorsal heart via ostia equipped with valves. Hemolymph pressure low, but metabolic demands met in many arthropods and most molluscs partly because tracheal system supplies oxygen or small size. Annelids, earthworms, cephalopods and chordates possess closed circulation confining blood within vessels enabling higher pressure and directed flow.
Ref: NCERT Class 11 Chapter 18 Body Fluids Circulation Open System; Campbell Biology 12th ed. Chapter 42