The _____________ regulates the flow of contents from the stomach to the duodenum.
fundus
gastric rugae
pyloric sphincter
Antrum
The Correct Answer is C
A. Fundus is the upper part of the stomach, which does not regulate the flow of contents to the duodenum.
B. Gastric rugae are folds in the stomach lining that allow for expansion but do not regulate the flow of contents to the duodenum.
C. Pyloric sphincter controls the flow of partially digested food (chyme) from the stomach into the duodenum.
D. Antrum is the lower portion of the stomach that helps in mixing and grinding food but does not directly regulate its flow to the duodenum.
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Correct Answer is B
Explanation
A. Chief cells secrete pepsinogen, not HCl.
B. Parietal cells in the stomach lining are responsible for secreting hydrochloric acid (HCl). This acid is crucial for digestion and killing pathogens.
C. Mucous cells secrete mucus, which protects the stomach lining from the acidic environment. They do not secrete HCl.
D. Regenerative (stem) cells are involved in the renewal of the stomach lining, but they do not secrete HCl.
Correct Answer is A
Explanation
A. Renal corpuscle: Blood plasma is filtered in the renal corpuscle, which includes the glomerulus and Bowman's capsule.
B. Renal capsule: The renal capsule is the outer protective layer of the kidney and does not filter blood plasma.
C. Renal tubule: The renal tubule is involved in reabsorption and secretion, not in the initial filtration of blood plasma.
D. Renal column: The renal column is a structural part of the kidney, not involved in filtering blood plasma.