In a histology section of the digestive tract, you observe that the mucosa is made of simple columnar epithelium and the tissue has three layers of smooth muscles. this section represents

Out of the following given choices;

stomach

duodenum

large intestine

esophagus

The answer is duodenum. This region’s (of the gastrointestinal tract) mucosal layer is composed of three layers; epithelium, lamina propria, and muscularis mucosae. Muscularis mucosae is the layer of smooth muscle. The epithelium is composed of simple columnar cells (aka enterocytes) with a brush border and interspersed goblet cells.

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

The  correct answer should be a waste