Nokea
The function of the parietal cells of the stomach is to:
- A. Secrete pepsinogen for protein digestion
- B. Secrete mucus for lubrication
- C. Secrete the hormone gastrin
- D. Produce intrinsic factor required for absorption of vitamin B12
Correct Answer: D
Rationale: Parietal cells produce intrinsic factor, essential for vitamin B12 absorption, and hydrochloric acid, not the other functions listed.
You may also like to solve these questions
Which of the following is not a function of saliva?
- A. to initiate protein digestion
- B. to aid in cleansing the teeth
- C. to lubricate the pharynx
- D. to assist in formation of the bolus
Correct Answer: A
Rationale: Saliva contains amylase for carbohydrate digestion, but it does not initiate protein digestion.
Centro acinar cells, all true except:
- A. Beginning of pancreatic duct system.
- B. Secrete bicarbonate ion (with intercalated ducts)
- C. Its secretion is controlled by secretin hormone
- D. Beginning of biliary duct system
Correct Answer: D
Rationale: Centroacinar cells are part of the pancreatic exocrine duct system, not the biliary system, which involves bile ducts.
The enzyme_________________________________ is made by the pancreas and breaks longer amino acid chains into short amino acid chains.
- A. secretin
- B. pepsin
- C. erepsins
- D. trypsin
Correct Answer: D
Rationale: Trypsin, secreted by the pancreas, breaks down larger polypeptides into shorter peptide chains during protein digestion.
Ficks law, describes the effects of various factors on the rate of diffusion. Which statement is true?
- A. The smaller the difference in concentrations the greater the rate of diffusion
- B. The larger the surface area/volume ratio the greater the rate of diffusion
- C. The use of a Transporter Room (as seen in Star Trek) the greater the rate of diffusion
- D. The thicker the exchange surface the greater the rate of diffusion
Correct Answer: B
Rationale: Fick's law states that diffusion rate increases with a larger surface area, steeper concentration gradient, and thinner membrane.
Which of the following is not a function of saliva?
- A. to initiate protein digestion
- B. to aid in cleansing the teeth
- C. to lubricate the pharynx
- D. to assist in formation of the bolus
Correct Answer: A
Rationale: Saliva contains amylase for carbohydrate digestion, but it does not initiate protein digestion.