lecture 22 - the small intestine

Question 1

what neutralises the acid chyme that gets delivered into the small intestine

Answer 1

bicarbonate

Question 2

what are the three main regions of the small intestine and their length

Answer 2

• duodenum = ~25cm
• jejunum = ~2.5m
• ileum = ~3.6m
  total length = 6 m

Question 3

what happens in the duodenum

Answer 3

• receives chyme from the stomach
• makes the right environment

Question 4

what happens in the jejunum and ileum

Answer 4

digestion and absorption

Question 5

what is the small intestine held in place by

Answer 5

mesentery

Question 6

what does the mesentery contain

Answer 6

• arteries
• nerves
• veins
• lymphatics

Question 7

what are the plicae circulares

Answer 7

permanent large folds of the small intestine

Question 8

what are villi and what are they made of

Answer 8

there are numerous villi found on the surface of plicae circulares and they are made of mucusoa

Question 9

what is the function of the microvilli brush boarder

Answer 9

contact digestion = involves enzymes

Question 10

what is transcellular transport

Answer 10

moving through the cell

Question 11

what is paracellular transport

Answer 11

between the cells = controlled by tight junctions

Question 12

what are enterocytes of the small intestine

Answer 12

absorptive cells

Question 13

what is the ileocecal valve

Answer 13

controls from the small to large intestine