Question

what is the correct sequence for the layers in the walls of the alimentary canal from innermost to outermost?
multiple choice
serosa, muscular layer, mucosa, submucosa
mucosa, submucosa, muscular layer, serosa
mucosa, muscular layer, serosa, submucosa
submucosa, mucosa, serosa, muscular layer

Explanation:

The alimentary canal's wall has four main layers. The innermost is the mucosa which is in contact with the lumen. Next is the submucosa (connective tissue layer). Then the muscular layer (for peristalsis) and the outermost serosa (a protective membrane).

Answer:

Mucosa, submucosa, muscular layer, serosa.