Sieve plate is the found in the endothelium of:

Correct Answer: A

Rationale: Sieve plates are clusters of fenestrae in the endothelium of hepatic sinusoids, allowing plasma exchange with the space of Disse.

Correct Answer: A

Rationale: Mucus secreted by gastric cells forms a protective barrier against HCl, preventing damage to the stomach lining.

Correct Answer: A

Rationale: The frenulum is a fold of tissue that anchors the tongue to the floor of the mouth.

Correct Answer: B

Rationale: Islets of Langerhans are endocrine (ductless) glands in the pancreas that secrete hormones like insulin.

Correct Answer: C

Rationale: The serosa, the outermost layer of the gut, is made of mesothelium and connective tissue.