Life Sciences Paper 1, November 2024, question 3.4.3
Life Sciences P1 · Homeostasis in humans
3.4.3(4)4 marks
The diagram below shows how the level of thyroxin in the blood of a healthy person is kept steady. A low thyroxin level at point X is detected by the body. Explain how the pituitary gland helps to bring thyroxin back to its normal level.
NSCBased on Nov 2024 · Paper 1 · Q3.4.3
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