where is columnar epithelial located write
Answers
ꜱɪᴍᴘʟᴇ ᴄᴏʟᴜᴍɴᴀʀ ᴇᴘɪᴛʜᴇʟɪᴀ ᴀʀᴇ ꜰᴏᴜɴᴅ ɪɴ ᴛʜᴇ ꜱᴛᴏᴍᴀᴄʜ, ꜱᴍᴀʟʟ ɪɴᴛᴇꜱᴛɪɴᴇ, ʟᴀʀɢᴇ ɪɴᴛᴇꜱᴛɪɴᴇ, ʀᴇᴄᴛᴜᴍ, ꜰᴀʟʟᴏᴘɪᴀɴ ᴛᴜʙᴇꜱ, ᴇɴᴅᴏᴍᴇᴛʀɪᴜᴍ, ᴀɴᴅ ʀᴇꜱᴘɪʀᴀᴛᴏʀʏ ʙʀᴏɴᴄʜɪᴏʟᴇꜱ. ɪɴ ᴇꜱꜱᴇɴᴄᴇ, ᴛʜᴇʏ ᴀʀᴇ ꜰᴏᴜɴᴅ ɪɴ ᴘᴀʀᴛꜱ ᴏꜰ ᴛʜᴇ ʀᴇꜱᴘɪʀᴀᴛᴏʀʏ, ᴅɪɢᴇꜱᴛɪᴠᴇ ᴀɴᴅ ʀᴇᴘʀᴏᴅᴜᴄᴛɪᴠᴇ ᴛʀᴀᴄᴛꜱ ᴡʜᴇʀᴇ ᴍᴇᴄʜᴀɴɪᴄᴀʟ ᴀʙʀᴀꜱɪᴏɴ ɪꜱ ʟᴏᴡ, ʙᴜᴛ ꜱᴇᴄʀᴇᴛɪᴏɴ ᴀɴᴅ ᴀʙꜱᴏʀᴘᴛɪᴏɴ ᴀʀᴇ ɪᴍᴘᴏʀᴛᴀɴᴛ.
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Answer:
Simple columnar epithelia are found in the stomach, small intestine, large intestine, rectum, fallopian tubes, endometrium, and respiratory bronchioles. In essence, they are found in parts of the respiratory, digestive and reproductive tracts where mechanical abrasion is low, but secretion and absorption are important.
Explanation:
Simple columnar epithelia are found in the stomach, small intestine, large intestine, rectum, fallopian tubes, endometrium, and respiratory bronchioles. In essence, they are found in parts of the respiratory, digestive and reproductive tracts where mechanical abrasion is low, but secretion and absorption are important. For instance, in female reproductive organs, this epithelium lines the fallopian tubes, endometrium and the inner part of the cervix (endocervix). The external ectocervix, vagina and labia that are in contact with the external environment, are lined by stratified tissue.
In the respiratory system, the upper respiratory tract traps large dust particles or bacteria. This region is lined with stratified epithelia. As the passages narrow, however, the epithelium shifts to simple columnar in the bronchioles. Predictably, toxic fumes or viral particles that can escape the protective mechanisms of the upper respiratory tract are the most common causes for infections in this region of the respiratory system. As the passages narrow further, a single layer of squamous cells lines the alveoli, where flattened cells allow transport of gases.
This epithelium is also seen in the stomach, small and large intestine, where food has largely been transformed into a homogeneous, liquid chyme. In the mouth, esophagus and anus, where textures can vary, stratified epithelia protect underlying tissues.