Homeostasis
14.4What the syllabus asks of you
- Describe homeostasis as the maintenance of a constant internal environment
- Explain the concept of control by negative feedback with reference to a set point
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Chapter 14: Homeostasis
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2 questions
1May / June 2020 · Paper 12 · Q20Also set in May / June 2020 Paper 11Show mark scheme →
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.
CA higher 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.
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2Oct / Nov 2019 · Paper 12 · Q21Also set in Oct / Nov 2019 Paper 11Show mark scheme →
Acerebellum
Bhypothalamus
Cmedulla
Dpituitary gland
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