what is villi?explain
Answers
Explanation:
Intestinal villi (singular: villus) are small, finger-like projections that extend into the lumen of the small intestine. Each villus is approximately 0.5–1.6 mm in length (in humans), and has many microvilli projecting from the enterocytes of its epithelium which collectively form the striated or brush border. Each of these microvilli are much smaller than a single villus. The intestinal villi are much smaller than any of the circular folds in the intestine.
Intestinal villus
Micrograph of the small intestine mucosashowing villi - top half of image. H&E stain
Section of duodenum of cat. X 60.
DetailsPart ofWall of small intestineSystemDigestive systemIdentifiersLatinvilli intestinalesTAA05.6.01.011FMA76464Anatomical terminology
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Villi increase the internal surface area of the intestinal walls making available a greater surface area for absorption. An increased absorptive area is useful because digested nutrients (including monosaccharide and amino acids) pass into the semipermeable villi through diffusion, which is effective only at short distances. In other words, increased surface area (in contact with the fluid in the lumen) decreases the average distance travelled by nutrient molecules, so effectiveness of diffusion increases. The villi are connected to the blood vessels so the circulating blood then carries these nutrients away.
Explanation:
The inner wall of small intestine has a number of finger- like outgrowths called villi.The villi increase the surface area for absorption of the digested food. The food substances are absorbed by the villi and then transported through the blood vessels to different organs of the body.