Many capillaries to carry substance away quickly Each villus is a lacteal or lymphatic capillary surrounded by blood capillaries. This continuous transport of digested food substances away from the villus maintains the concentration gradient for absorption.
Increased intestinal surface area 1 cell thick epithelium
Q. How is Concentration gradient maintained at the site of the intestinal villus? A concentration gradient is maintained at the villus by the continual transport of digested food substances away from the villus.
How does absorption take place? Legend Glucose amino acids fatty acid & glycerol fat molecule
Glucose & amino acids diffuses into blood capillaries of villi Glucose & amino acids also enters via active transport Glycerol & fatty acid diffuse into the epithelium, then combines back when they enter lacteal Water & mineral salts also absorbed. How does absorption take place?