Multiple choice

Which of the following statements regarding the coordination of activities in sponges is INCORRECT?

  1. Glass sponges rapidly transmit electrical impulses through all parts of the syncytium.

  2. Myocytes are thought to be responsible for transmitting signals between different parts of the body.

  3. Adult sponges are well equipped with neurons.

  4. Some species can contract the osculum independently of the rest of the body.

  5. Sponges may also contract in order to reduce the area that is vulnerable to attack by predators.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Adult sponges lack neurons or any other kind of nervous tissue. However most species have the ability to perform movements that are coordinated all over their bodies, mainly contractions of the pinacocytes, squeezing the water channels and thus expelling excess sediment and other substances that may cause blockages.

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