Respuesta :
The layer responsible for the motility which propels food and residue through the digestive tract is called the muscularis externa (option b). Muscularis externa forms the smooth muscles of the alimentary canal and helps in carrying out peristalsis throughout the GI (Gastrointestinal) tract for motility of food and residues.
What is peristalsis?
It is the involuntary contraction and relaxation of the smooth muscles of the alimentary canal and the intestines which creates a wave-like movement to propel the food along GI tract. This movement is sequential and alternative in nature. The act of peristalsis also helps in mixing of the food with the digestive juices.
What is muscularis externa?
The smooth muscle linings of the alimentary canals form the muscularis externa. The alternate relaxation and contraction of the circular and longitudinal layers of the muscularis externa helps in carrying out the phenomenon of peristalsis.
What is lumen?
Lumen forms the inner openings of the blood vessels (artery, vein or capillary), gastrointestinal tracts, the bronchi pathways, the renal tubules, collecting ducts such as an artery or intestine, etc. In Latin, the word 'lumen' means 'an opening'. Lumen helps in transportation of the bodily fluids, foods and waste materials throughout the body.
What is submucosa?
This substantial layer of loose connective tissue is present underneath the layer mucosa. Blood arteries, lymphatic vessels, and neurons are also present in this stratum. Glands are generally present in this layer. The submucosal layer helps mucosal layer to move with flexibility during peristalsis.
What is mucosa?
The Mucous membrane is also known as mucosa. Our body cavities and internal organs that are exposed to outside debris are lined with mucosa. These organs and cavities are lubricated by the mucous membrane, which also shields them from invasive microorganisms as well as abrasive particles and bodily fluids.
What is serosa?
The serous membrane (also known as serosa) is a mesothelium-based smooth tissue membrane that lines the interior of bodily cavities and their contents. It secretes serous fluid to facilitate lubricated sliding motions between opposing surfaces.
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