O-LevelBiologyCoordination & Response5090/11 · May/June 2020 · Q201 Mark
Which of these statements describes control by negative feedback?
AAn injury to body tissue activates platelets in the blood and these activated platelets release chemicals which activate more platelets.
BDuring the menstrual cycle, luteinising hormone (LH) stimulates the release of oestrogen which in turn stimulates the release of more LH.
Chigher concentration of carbon dioxide in the atmosphere increases temperature, which increases photosynthesis producing more carbon dioxide.
DWhen blood pressure is high, nerve impulses from the brain cause the blood vessels to dilate and blood pressure is reduced.
✓ Correct answer
D: When blood pressure is high, nerve impulses from the brain cause the blood vessels to dilate and blood pressure is reduced.
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