describe the muscle tissue in the villi??? i need the answer quickkkkkkkkkkk

  • 1 vote

describe the muscle tissue in the villi??

Posted Mon 23rd May, 2011 @ 06:11 by al000y

3 Answers

  • 3 votes

So the villi are made covered in lots of microvilli, which increases their surface area hugely, which is of course a great thing for substance exchange, as a larger surface area means quicker diffusion/osmosis/active transport. The cells in the villi also contain lots of Mitochondria, which is the site for respiration. This is to produce energy to fuel active transport, which is necessary to absorb many of the substances from the small intestine. Another thing is that they have thin walls, only one cell thick usuallly, and the blood capillaries that run through them are close to the surface, so substance exchange can occur much more easily...

Hope this  helps :D

Answered Mon 23rd May, 2011 @ 08:51 by Evan Wroe
  • 1 vote

There are circular and longitudinal muscles in the small intestine which contract to move food along by peristalsis. This maintains the concentration gradient between the food and the blood in the villi, allowing for more efficient absorption. 

Answered Mon 23rd May, 2011 @ 09:48 by Megan
  • 1 vote

the epithelial cells of villi have extensions that are called microvilli, thus increasing the surface area further

Answered Tue 24th May, 2011 @ 08:06 by saraht