Ondansetron

On Da Serotonin Receptor. Selective 5-HT3 antagonist central antiemetic.

Misopprostol

Mi So PROtected by mucous.
also Prost in the name for PGE1.

Used for NSAID peptic ulcers. Also maintain PDA. (MI SO Patent)

Papillae

Filiform fill most of the space.
Fungiform are mixed Among them.
circumVallate form the the letter "V".