When the cell concentrates potassium within, against the natural tendency of matter, it is performing
a. passive diffusion
b. facilitated diffusion
c. active transport
d. pinocytosis

When the cell concentrates potassium withing, against the natural tendency of matter, it is performing active transport. The correct answer is C. 

Calcinosis is the diagnostic term that means an abnormal buildup of calcium on the kneecap (patellar) surface. it is a term uses to describe a group of disorders in which calcium deposits form in the skin. it is also referred to the abnormal deposit of calcium phosphate.

The correct answer is amu.