OESOPHAGUS STOMACH
ECHINODERMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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death.
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an adhesive chemical to be released onto the tube feet.
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the arm of the echinoderm to move.
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the starfish to get up and walk upright.
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Detailed explanation-1: -The tube feet are extended by contractions of localized muscle areas in the radial canals (ophiuroids) or by contractions of offshoots of the radial canals called ampullae (asteroids, concentricycloids, echinoids, and holothurians); the contractions force fluid into the tube feet, which then extend.
Detailed explanation-2: -Each tube foot consists of two parts: the ampulla and the podium. The ampulla is a water-filled sac contained in the body of the animal that contains both circular muscles and longitudinal muscle. The podium is the tube-shaped structure that protrudes from the body and contains longitudinal muscle only.
Detailed explanation-3: -All echinoderms have unique hydraulic structures called tube feet, known for their roles in light sensitivity, respiration, chemoreception and locomotion.
Detailed explanation-4: -Answer: Tube feet consist of two parts: ampullae and podia. False Feet-A pseudopod or pseudopodium (plural: pseudopods or pseudopodia) (from the Greek word , “false” + “foot") is a temporary cytoplasm-filled projection of an eukaryotic cell membrane or a unicellular protist.