Final Answer:
The decrease in cell size, often observed when cells adapt to reduced work demands or adverse environmental conditions, is referred to as "atrophy."
Step-by-step explanation:
Atrophy is the process where cells shrink in size due to a decrease in workload or unfavorable conditions. This reduction in cell size allows cells to function at a lower, more efficient level to support survival. Atrophy can occur in various tissues and organs throughout the body in response to decreased demand or adverse circumstances, leading to a decrease in both cell size and tissue mass.