chapter 18 the digestive system assignment human physiology
What kind of cells produce hydrochloric acid in the stomach?
Parietal cells
How are the products of carbohydrate digestion absorbed?
Enter the villi, then into blood capillaries Correct
the pancreas secretes pancreatic juice into the?
duodenum
Gastric acid is the direct cause of most peptic ulcers.
false
H+ are passively moved into the lumen of the gastric gland from the parietal cell.
false
bile is stored in the?
gallbladder
digest triglycerides
lipase
in the pancreas, the ______ secrete insulin and glucagon into the blood?
pancreatic islets
Carbohydrate digestion begins in the mouth with the secretion of __________, but most occurs in the duodenum as a result of the secretion of __________.
salivary amylase; pancreatic amylase
Pancreatic juice and bile secretion are regulated by the
the duodenal papilla
digest protein
trypsin
Why is bicarbonate an important component of pancreatic juice?
Bicarbonate increases the pH, providing an optimal environment for the enzymes in pancreatic juice.
What molecule from the blood is initially used for the production of hydrochloric acid?
CO2
What do lipid digestion products form to be absorbed into the lacteals?
Chylomicrons
Which of the following stimulates the secretion of hydrochloric acid (HCl) by the parietal cells?
Histamine stimulates parietal cells to secrete acid.
What is the function of the microvilli of the intestinal mucosa?
Increase surface area for absorption
Why might a drug like Tagamet, an H2-histamine receptor blocker, be taken to treat a peptic ulcer?
It stops acid production stimulated by histamine
What ion enters the parietal cell in exchange for the H+ leaving the cell?
K+
What is the final product of protein digestion?
amino acids
digest starch
amylase
In the parietal cells, the enzyme carbonic anhydrase causes a reaction between __________ and __________.
carbon dioxide; water
What ion is exchanged for the bicarbonate when it moves into the blood?
cl-