small intestines

function of small intestines

breaks down food

small intestines has 3 regions

duodenum, jejunum, ileum

duodenum

-receives chyme from stomach

-enzyme(digestion) and juices (buffer) from pancreas

red

-jejunum

nutrient absorption occurs here

-most folds and surface area for absorption

bottom part of colon

little nutrient absorption, recycles bile and enzymes

cells in small int

Simple columnar cells

Simple columnar cells in the small intestine

secrete: hormones and enzymes

absorb: nutrients

under simple columnar e.t in small int

-lipids enter the sympathic system through lacteals.

-veins

permanent folds in stomach

circular folds

-have villi and microvilli

villi

contain blood vessels and lymph capillaries to absorb nutrient

microvilli

maximize absorption and have digestive enzymes