Negative feedback counteracts deviations to maintain homeostasis

Steps:

• Identify negative feedback as a mechanism where a stimulus triggers an opposing response to reduce the stimulus.
• Examine each option for whether the described process opposes or amplifies the initial change.
• Rule out amplification (positive feedback) in options A and C.
• Confirm opposition to the change in the remaining option.

Why D is correct:

• Matches negative feedback definition: high blood pressure (stimulus) triggers vessel dilation (opposing response), lowering pressure to restore balance.

Why the others are wrong:

• A: Amplifies injury response by activating more platelets, defining positive feedback.
• B: Oversimplifies menstrual cycle; estrogen typically triggers LH surge via positive feedback before inhibition.
• C: Higher CO2 indirectly increases its own consumption, but temperature link describes positive reinforcement, not direct opposition.

Final answer: D