Respiratory trees

Definition

Respiratory trees are branched, tubular structures found in sea cucumbers that facilitate gas exchange. They extend from the cloaca and are involved in both respiration and excretion.

5 Must Know Facts For Your Next Test

1. Respiratory trees are unique to sea cucumbers among echinoderms.
2. They function by pumping water through the cloaca to facilitate gas exchange.
3. The respiratory trees also play a role in expelling waste products from the body.
4. These structures can be ejected by sea cucumbers as a defensive mechanism.
5. Respiratory trees are connected to the coelomic cavity, allowing for efficient distribution of oxygen throughout the organism.

Review Questions

Related terms

cloaca:

A common chamber into which intestinal, urinary, and reproductive tracts open; present in several animal groups including birds, reptiles, and some fish.

coelom:

A fluid-filled body cavity within animals that houses internal organs and provides space for organ development and movement.

echinodermata: A phylum of marine animals characterized by radial symmetry, a calcareous endoskeleton, and a water vascular system; includes starfish, sea urchins, and sea cucumbers.