Question 1

Which exocrine glands lack mucus-type acini?

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:

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:

Accepted Answer

Amelogen is a protein that is very abundant in enamel.

Question 4

Odontoblast processes (Tomes' fibers)are found in:

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:

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:

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.

Quiz 12: Upper Digestive System

Which exocrine glands lack mucus-type acini?

Large numbers of mitochondria,interposed between basal infoldings of the plasma membrane,are found in:

Amelogen is a protein that is very abundant in:

Odontoblast processes (Tomes' fibers) are found in:

A serous demilune is a component of a:

A lingual papilla having a thin,pointed tip is termed a: