OESOPHAGUS STOMACH
ECHINODERMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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tube feet control a complex excretory system that empties into the central disc
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a heart pumps water through the veins instead of blood
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water pressure controls the tube feet and aids in circulation and respiration
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tube feet move water through the gut of the animal
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Detailed explanation-1: -Echinoderms have a characteristic coelomic water vascular system. This system is controlled hydraulically. It comprises a circumoral ring covering the esophagus which connects radial canals. The radial canals lead to an ambulacrum.
Detailed explanation-2: -Water vascular system is a unique characteristic of echinoderms. It helps in locomotion, the capture of food and respiration.
Detailed explanation-3: -For most echinoderms, the tube feet are the primary link between the water vascular system and the outside world. Water vascular system means instead of blood, like most animals, these creatures have water running through their body to help with all their movements.
Detailed explanation-4: -They are known for their five-point radial symmetry and specialized water vascular system, which depends on changes in water pressure to extend or contract tiny tube feet. Pumping water through this system allows echinoderms to eat, move, or cling to surfaces, but it doesn’t generally enable very rapid movement.