Vcaa 07 qn

[saheh]

MC q16
Homeostatic systems comprise components such as sensors, effectors, and variables. In such systems the component being kept relatively constant is:
A.) variable
B.) input to sensor
C.) input to effector
D.) outpu from effector

I wasn't sure, picked B, answer is A? How? Isn't the variable the thing that changes???

[Daenerys Targaryen]

it is, but thats what we're trying to keep constant. although it fluctuates the ultimate aim is to bring it back to the set point.