You Look Like a Sea Cu­cum­ber

We share a 450-mil­lion-year-old ancestor with sea cu­cum­bers, and the fam­ily re­sem­blance is still ev­i­dent.

Science Illustrated - - HUMANS -

Mouth

Just like us, sea cu­cum­bers have mouths, which they use to con­sume food. How­ever, sea cu­cum­bers take one step fur­ther with ten­ta­cles, which can cap­ture the food.

Ner­vous sys­tem

Sea cu­cum­bers have a cen­tral ner­vous sys­tem: a ring of nerves around the mouth, and more nerves lead to the rest of the body. These nerves are pro­duced by sup­port­ing cells just like in hu­mans.

Bow­els

Dur­ing the em­bry­onic stage of sea cu­cum­bers and hu­mans, the anus de­vel­ops first, fol­lowed by the bow­els and the mouth, as op­posed to other crea­tures such as in­sects and mol­luscs. More­over, some sea cu­cum­bers have gul­lets and stom­achs just like us.

Mus­cles

Sea cu­cum­ber mus­cles are sim­ple,but they still con­sist of both skele­tal and smooth mus­cu­la­ture just like ours. Sea cu­cum­ber mus­cles let the body can con­tract and the ten­ta­cles can be moved.

Newspapers in English

Newspapers from Australia

© PressReader. All rights reserved.