Intestines Flashcards
1
Q
Which substance is the most abundant in chyme?
A
Water
2
Q
What % of water does the small intestine reabsorb?
A
80%
3
Q
Which part of the small intestine reabsorbs the most water?
A
Jejunum
4
Q
How much water is excreted int the stools?
A
200ml - 2%. 98% of water is reabsorbed.
5
Q
How permeable is the epithelium of the small intestine to water?
A
Very permeable
6
Q
What solute is the most abundant in chyme?
A
Na+. It is actively transported from the lumen in the cell membranes of the ileum and jejunum.
7
Q
The contents of the colon are iso-osmotic. What does this mean?
A
Concentration in lumen of colon = that of the blood
8
Q
How does the colon contents remain alkaline?
A
Cl- is actively reabsorbed in exchange for bicarbonate.
