A baby is born without the ability to make parietal cells. This baby would not be able to ___.

Question

A.  denature (unfold) milk proteins
B.  absorb glucose and galactose
C.  emulsify fats
D.  digest fats
E.  digest lactose

Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?

Gather Content
· What do you know about the function of parietal cells? What other information is related to the question?

Choose Answer
· Given what you now know, what information is most likely to produce the correct answer?

Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?


Answer 1

A.  denature (unfold) milk proteins

Clarify Question
· What is the key concept addressed by the question?
        o The question asks about the function of parietal cells.
· What type of thinking is required?
        o You are being asked to apply your knowledge about the function of parietal cells.

Gather Content
· What do you know about the function of parietal cells? What other information is related to the question?
        o The stomach contains a third layer of smooth muscle for churning food and mixing it with gastric juice, an acidic secretion of the tubular gastric glands of the mucosa. These exocrine glands contain three kinds of secretory cells: mucus-secreting cells, parietal cells, which secrete hydrochloric acid (HCl), and chief cells, which secrete pepsinogen, the inactive form of the protease (protein-digesting enzyme) pepsin.

Choose Answer
· Given what you now know, what information is most likely to produce the correct answer?
        o Parietal cells produce HCl and this acid helps to denature proteins in the diet. If a baby lacked parietal cells, they could not produce HCl to be secreted in the stomach, and proteins in milk that the baby consumed would not be denatured or unfolded. This would make it more difficult for the baby to digest the milk proteins.

Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
        o This question asked you to apply your knowledge about the function of parietal cells. If you got the correct answer, great job! If you got an incorrect answer, where did the process break down? Did you think parietal cells produce bile acids that help emulsify fats? Did you think that parietal cells produce digestive enzymes?