Final answer:
In the context of systems biology, a smaller system within a larger one is known as a subsystem. This concept is exemplified in negative feedback systems where components like sensors, control centers, and effectors work within larger systems to maintain homeostasis.
Step-by-step explanation:
If a system is one of the components of a larger system, it is considered a subsystem. In biological contexts, organisms use feedback mechanisms, such as negative feedback, to maintain their internal environments in response to external environmental changes. A negative feedback system typically includes a sensor (or receptor), a control center, and an effector. The sensor monitors a physiological value, reporting to the control center, which then compares the value to the normal range. If necessary, the effector is activated to return the system to equilibrium, illustrating how a subsystem can operate within a larger biological system.