If youâre a beginner who has yet to acquire a Quadcopter, headless mode can prove to be a headache-less choice. For a new pilot still adjusting to flying a quadcopter, taking complex orientation out of the equation is one less variable to worry about. Choosing headless mode however, can limit your options for upgrades.
THE HUMAN DIGESTIVE SYSTEM. EPITHELIAL CELLS. ORGANS. TISSUES. Epithelial cells are highly specialized cells that line the small intestine. They help with the process of absorption of water, glucose molecules and mineral ions.The cells surface if highly folded, since this greatly increases the surface area of the cell. picture of the small intestine. TISSUES. A tissue is a group of similar cells performing a particular function. Simple tissues are composed of one type of cell, while; Compound tissues are composed of more than one type of cell.
If the lining of the stomach is examined with a hand lens, one can see that it is covered with numerous small holes. These are the openings of gastric pits which extend into the mucosa as straight and branched tubules, forming gastric glands. Types of Secretory Epithelial Cells.1  Mucous cells: secrete an alkaline mucus that protects the epithelium against shear stress and acid. 2  Parietal cells: secrete hydrochloric acid! 3  Chief cells: secrete pepsin, a proteolytic enzyme. 4  G cells: secrete the hormone gastrin.here are differences in the distribution of these cell types among regions of the stomach-for example, parietal cells are abundant in the glands of the body, but virtually absent in pyloric glands.