An Automatic Air Vent Controls the Airflow Out of the System

question 14

Short Answer

An automatic air vent controls the airflow out of the system by means of a(n) ____________________, which rises and falls with the amount of air in the system.

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Definitions:

Mucus

A viscous, slippery secretion produced by, and covering, mucous membranes.

Esophageal Sphincter

A ring of muscle at the end of the esophagus that closes to prevent stomach acid from coming back up, and opens to allow food to enter the stomach.

Hepatic Duct

A duct that leaves the liver carrying bile and merges with the cystic duct to form the common bile duct.

Cystic Duct

The duct from the gallbladder that merges with the hepatic duct to form the common bile duct.