Considering the diagram above, the component that is being kept relatively constant is A - VCE - SSCE Biology - Question 15 - 2005 - Paper 1

In a feedback loop, the component that is kept relatively constant is typically referred to as the variable. The variable is the factor being monitored and controlled to maintain homeostasis. In this case, option A 'the variable' is most appropriate as it is the component that the system regulates. Therefore, the correct answer is: A. the variable.