Question 1

Which exocrine glands lack mucus-type acini?&#10;A) Labial glands&#10;B) Palatine glands&#10;C) Parotid glands&#10;D) Sublingual gland&#10;E) Submandibular gland

Accepted Answer

The parotid glands lack mucus-type acini and predominantly secrete serous fluid. The labial glands, palatine glands, sublingual gland, and submandibular gland all contain both serous and mucus-type acini.

Question 2

Large numbers of mitochondria,interposed between basal infoldings of the plasma membrane,are found in:&#10;A) Intercalated ducts&#10;B) Mucous acini&#10;C) Myoepithelial cells&#10;D) Serous acini&#10;E) Striated ducts

Accepted Answer

Striated ducts have large numbers of mitochondria interposed between basal infoldings of the plasma membrane. This high concentration of mitochondria allows for active transport of ions and organic molecules, which helps to modify and concentrate the saliva produced by the acinar cells.

Question 3

Amelogen is a protein that is very abundant in:&#10;A) Cementum&#10;B) Dentin&#10;C) Enamel&#10;D) The periodontal ligament&#10;E) The pulp cavity of a tooth

Accepted Answer

Amelogen is a protein that is very abundant in enamel.

Question 4

Odontoblast processes (Tomes' fibers)are found in:&#10;A) Cementum&#10;B) Dentin&#10;C) Enamel&#10;D) The periodontal ligament&#10;E) The pulp cavity of a tooth

Accepted Answer

Odontoblast processes, also known as Tomes' fibers, are found in dentin. They are long, finger-like extensions of the odontoblasts that extend into the dentinal tubules.

Question 5

A serous demilune is a component of a:&#10;A) Circumvallate papilla&#10;B) Intercalated duct&#10;C) Mucous acinus of the submandibular gland&#10;D) Serous acinus of the parotid gland&#10;E) Striated duct

Accepted Answer

A serous demilune is a feature observed in mucous acini, particularly in the submandibular gland, where it appears as a cap of serous cells on the mucous acini. This structure is thought to produce a serous fluid that mixes with the mucous secretion.

Question 6

A lingual papilla having a thin,pointed tip is termed a:&#10;A) Circumvallate papilla&#10;B) Filiform papilla&#10;C) Foliate papilla&#10;D) Fungiform papilla&#10;E) Vermiform papilla

Accepted Answer

A lingual papilla with a thin, pointed tip is a characteristic of the filiform papilla. The circumvallate papilla is large and round with a trench surrounding it, the foliate papilla is leaf-shaped and located on the lateral margins of the posterior tongue, the fungiform papilla is mushroom-shaped and scattered throughout the tongue, and the vermiform papilla does not exist.

Deck 12: Upper Digestive System