<Li> the borders that separate and link sarcomeres within a skeletal muscle </Li> <Li> a ban on a user's IP address for the purposes of blocking their access to Internet Relay Chat . See Z - line . </Li> <Li> the gastroesophageal junction that joins the esophagus to the stomach . </Li> <Li> Z, a New York City Subway service . </Li>

What is the z line in the stomach