Secretion

Question 1

how many liters of fluid pass through the GI tract daily

Answer 1

9L total; 2L flood and drink and 7L secretions into the lumen

Question 2

name the 7 secretions

Answer 2

1. HCl
2. bicarbonate
3. NaCl
4. digestive enzymes
5. mucus
6. saliva
7. bile

Question 3

HCl:
secreted by _________ in the stomach with a pH of ______
1. active transport of ___
2. ______ allows Cl- into the lumen
3. _________ is secreted into capillaries so blood passing by does become too _____

Answer 3

HCl:
secreted by PARIETAL CELLS in the stomach with a pH of 1 OR 2
1. active transport of H+
2. CFTR allows Cl- into the lumen
3. BICARBONATE is secreted into capillaries so blood passing by does become too ACIDIC

Question 4

bicarbonate:

1. _________ and duodenum to neutralize acidic chyme form the stomach

Answer 4

pancreas

Question 5

NaCl (saline):

used as a lubricant in the _____ and ________

Answer 5

small and large intestines

Question 6

digestive enzymes:

1. ______ glands located in the stomach, duodenum, pancreas, mouth
2. most are secreted in an inactive form called _______
3. activated via other enzymes, ________, hormones, or the ______ itself
4. also called _______ what kind of rxns

Answer 6

digestive enzymes:

1. EXOCRINE glands located in the stomach, duodenum, pancreas, mouth
2. most are secreted in an inactive form called ZYMOGENS
3. activated via other enzymes, PARACRINES, hormones, or the SUBSRATE itself
4. also called HYDROLASES what kind of rxns (HYDROLYSIS RXNS)

Question 7

mucus:
secreted by __________
name the three functions of mucus

Answer 7

goblet cells

1. lubrication/motility
2. protection - acids and bacteria
3. found in: stomach and intestines

Question 8

saliva:

contains mucus, _________, and ________

Answer 8

saliva:

contains mucus, SALIVARY AMYLASE and LYSOZYMES

Question 9

bile is produced by _______ but stored and released by ________. secreted into _________

Answer 9

hepatocytes, gallbladder, duodenum