Which of the following sphincters is under voluntary control? O Sphincter for the main pancreatic duct External anal sphincter O Internal anal sphincter O Pyloric sphincter O Cardiac sphincter...

Extracted text: Which of the following sphincters is under voluntary control? O Sphincter for the main pancreatic duct External anal sphincter O Internal anal sphincter O Pyloric sphincter O Cardiac sphincter Question 38 What is the submucosa of the alimentary canal? O A mucous lined layer of goblet cells O A thick smooth muscle layer for movement O A thin epithelial layer that is continuous with the mesentery O A layer of connective tissue that includes a nerve plexus and blood vessels O Layer that lines the lumen of the canal