GENERAL HISTOLOGY

OESOPHAGUS STOMACH

ECHINODERMS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
To eat, a sea star ____
A
Filters surrounding water for plankton
B
Bites its victim with a powerful beak
C
Paralyzes its prey with neurotoxins
D
Pushes its stomach out of its mouth and onto its prey
Explanation: 

Detailed explanation-1: -Stomach. A sea star has 2 stomachs, the cardiac stomach and the pyloric stomach. It can push the cardiac stomach out of its mouth, in the centre of its underside, to engulf prey or insert it into prey (between 2 shells, for example). The stomach then secretes a powerful digestive enzyme to break down the prey.

Detailed explanation-2: -Dinner Inside the Shell To eat shellfish, they use their powerful suckers to pry open a clam or oyster shell, then push their stomach out through their mouth and insert it inside the shell where they digest and absorb the soft inner tissues leaving an empty shell behind.

Detailed explanation-3: -Did you know that sea stars have a peculiar way of eating? They digest prey outside of their bodies by extruding their stomach out through their mouth and enveloping their meal. Once the food is digested, their stomach is drawn back into their body.

Detailed explanation-4: -The sea star eats by attaching to prey and extending its stomach out through its mouth. Enzymes from the sea star’s stomach digest the prey.

Detailed explanation-5: -“They crawl over the little mussels and use their tube feet to pry open the mussel shell, ” Kane said. “They basically stick their stomach into the nice gooey bits of the mussel and eat it. Then they take their stomach back in and move on to the next mussel.”

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