Final answer:
The term for a cell's high metabolic activity and performance of various functions within the organism is high metabolic rate.
Step-by-step explanation:
The metabolic state in which a cell's metabolic activity is very high and it performs various functions within the organism is referred to as high metabolic rate.
For example, hummingbirds have the highest metabolic rates among animals due to their small bodies and high levels of activity. This high metabolic rate allows them to perform various functions necessary for survival, such as flying and gathering nectar for energy.
High metabolic rate is associated with the release of energy through biochemical reactions in cells, which enable the cells to function properly and maintain life.