Which of the Following Are Noted as Small,dark Brushes with Their

question 16

Multiple Choice

Which of the following are noted as small,dark brushes with their bases near the dentinoenamel junction within mature enamel?

• A) Enamel tufts
• B) Enamel lamellae
• C) Enamel spindles
• D) Enamel rods

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Definitions:

Sodium-Potassium Pump

A membrane-bound transporter enzyme present in many cell (plasma) membranes that pumps sodium out of cells while pumping potassium into cells, thus maintaining the concentration and electrical gradients of these ions.

Endocytosis

Process by which a cell takes in a small amount of extracellular fluid (and its contents) by the ballooning inward of the plasma membrane.

Exocytosis

Process by which a cell expels a vesicle’s contents to extracellular fluid.

Entropy

A measure of disorder or randomness in a system, often associated with the second law of thermodynamics.