GENERAL HISTOLOGY

Detailed explanation-1: -MODIFIED T/F: The hydraulic suction of the AMPULLAE of sea stars can create enough force to open mollusk shells. FALSE.

Detailed explanation-2: -Sea stars have rows of tiny tube feet extending from the grooved surface on their underside. These tube feet allow them to crawl along the ocean floor using suction created by an internal water-driven hydraulic system.

Detailed explanation-3: -Locate the bulb-like top of a tube foot called the ampulla. This sac works like the top of an eyedropper to create suction. The bottom of the tube foot is a sucker.

Detailed explanation-4: -Sea stars, commonly called, “starfish, ” are not fish. Sea stars live only in saltwater. Sea water, instead of blood, is actually used to pump nutrients through their bodies via a ‘water vascular system. ‘ Also, sea stars move by using tiny tube feet located on the underside of their bodies.

Detailed explanation-5: -On the undersides of the arms are hundreds, sometimes thousands, of tiny tube feet called podia. The long slender tube feet are hollow and full of water, like miniature water balloons. Each tube foot is connected to its own tiny sac called an ampulla, that sits inside the body of the starfish.