Chordate Hallmarks Quiz

The incurrent siphon, or oral siphon, is used to draw water into the body of the adult sea squirt.

Adult ascidians lack a notochord and have only a single ganglion instead of a dorsal nerve cord.

The endostyle, a glandular groove along the midventral side of the pharynx, secretes mucus to form a net for filter feeding.

<p>Cilia on the gill bars pull the mucus net across the pharynx, trapping food particles. The net is then worked into a rope and carried to the esophagus and stomach.</p> Signup and view all the answers

<p>Nutrients are absorbed in the midgut of sea squirts.</p> Signup and view all the answers

<p>Indigestible wastes are discharged from the anus, located near the excurrent siphon.</p> Signup and view all the answers

<p>The circulatory system consists of a ventral heart and two large vessels, one on either side of the heart, connected to a diffuse system of smaller vessels and spaces.</p> Signup and view all the answers

<p>Respiratory exchange occurs in the pharyngeal basket of sea squirts.</p> Signup and view all the answers

<p>The circulatory system also serves the digestive organs, gonads, and other structures in sea squirts.</p> Signup and view all the answers

<p>Colonial sea squirts like Synoicum pulmonaria form colonies, while Ciona intestinalis is a solitary species.</p> Signup and view all the answers