Question

marine science chapter 10 interactive questions

	mouth action	opercula action	pharynx action	resulting water movement
open	□	□	□	□
close	□	□	□	□
expands	□	□	□	□
contracts	□	□	□	□
into the fish	□	□	□	□
out of the fish	□	□	□	□

Explanation:

This table describes the sequential actions of a fish's respiratory structures during ventilation:

1. First, the mouth opens, the pharynx expands, drawing water into the fish.
2. Then, the mouth closes, the opercula expand, the pharynx contracts, pushing water out of the fish through the opercular openings.

Answer:

	Mouth action	Opercula action	Pharynx action	Resulting water movement
close	☑️	☐	☐	☐
expands	☐	☑️	☑️	☐
contracts	☐	☐	☑️	☐
into the fish	☐	☐	☐	☑️
out of the fish	☐	☐	☐	☑️

(Note: The paired actions represent the two phases of fish respiration: water intake and water expulsion)