HI310 Lecture 11: Chapter-17-The-Sensory-System
24 Jan 2019
Department
Course
Professor
Document Summary
Food as we take it in is too large to enter cells. It must first be broken down into particles small enough to pass through cells" plasma membrane. The digestive tract is a continuous passageway beginning at the mouth, where food is taken in, and terminating at the anus, where the solid waste products of digestion are expelled from the body. The accessory organs, which are necessary for the digestive process but are not a direct part of the digestive tract, release substances into the digestive tract through ducts. These organs are the salivary glands, liver, gallbladder, and pancreas: mucous membrane (mucosa, submucosa, smooth muscle, serous membrane (serosa) The layer is so named because its epithelial layer contains many mucus-secreting cells. From the mouth through the esophagus, and also in the anus, the epithelium consists of multiple layers of squamous (flat) cells, which help to protect deeper tissues.
