��capillary, cell membrane,�bacterial colony, fungal mycelium, bone struc|ure, kidney tissue, nerve fiber, artery segment, tissue layer, microvilli, ciliated epithelium, lymph node, splenic follicle, thymus gland, adrenal gland, pancreatic islet, intestinal villi, gastric mucosa, duodenal papilla, jejunal crypt, rectal crypt, appendiceallymphoid tissue, mesenteric vessel, appendix structure, inpesdinal peristalsis, sacculated epithelium