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The _____________ regulates the flow of contents from the stomach to the duodenum.

A.

fundus

B.

gastric rugae

C.

pyloric sphincter

D.

Antrum

Answer and Explanation

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.


View Related questions

Correct Answer is C

Explanation

A. Posterior pituitary releases hormones such as ADH (antidiuretic hormone), but it does not have aldosterone receptors.

B. Proximal convoluted tubule is involved in reabsorption, but it does not have aldosterone receptors.

C. Distal convoluted tubule: Aldosterone receptors are found in the cells of the distal convoluted tubule. Aldosterone increases sodium reabsorption and potassium excretion in this part of the nephron, which helps regulate blood pressure and electrolyte balance.

D. Adrenal medulla produces catecholamines (e.g., adrenaline) but does not contain aldosterone receptors.

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.