Taste buds are found on the following papilla EXCEPT:

Correct Answer: B

Rationale: Filiform papillae lack taste buds and are primarily involved in touch sensation, unlike the other papillae types.

Correct Answer: B

Rationale: Carcinoid tumors arise from enteroendocrine (APUD) cells, which secrete hormones like serotonin.

Correct Answer: D

Rationale: Hepatocytes have microvilli facing the space of Disse, but not a brush border, which is characteristic of intestinal enterocytes.

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: B

Rationale: Pepsin is not a component of saliva; it is found in the stomach where it helps digest proteins. Saliva contains mucin, amylase, and IgA antibodies.