Absorption and Defecation

Question 1

what is primarily involved in absorption?

Answer 1

jejunum and ileum

Question 2

about the small intestine

Answer 2

-its lined with villi, which are covered with microvilli, increasing the surface area available for absorption

Question 3

villi

Answer 3

they contain a capillary bed and a lacteal, a vessel of the lymphatic system

Question 4

what enters the capillary bed?

Answer 4

water-soluble compounds

this includes monosaccharides, amino acids, water-soluble vitamins, small fatty acids, and water

Question 5

what enters the lacteal?

Answer 5

fat-soluble compounds, such as fats, cholesterol, and fat-soluble vitamins

Question 6

the large intestine

Answer 6

this absorbs water and salts, forming semisolid feces

Question 7

the cecum

Answer 7

this is an outpocketing that accepts fluid from the small intestine through the ileocecal valve and is the site of the appendix

Question 8

the colon

Answer 8

this is divided into ascending, transverse, descending and sigmoid portions

Question 9

the rectum

Answer 9

stores feces, which are then excreted through the anus

Question 10

what do gut bacteria produce?

Answer 10

vitamin K and biotin (vitamin B3)