A-Level Biology Specification

Edexcel B 9BI0

Section 9.2: Chemical control in mammals

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#9.2i

Understand the principles of mammalian hormone production by endocrine glands and their mode of action involving receptors on target cells.

#9.2ii

Know that there are two main modes of action in hormones:

- hormones attach to receptor sites and trigger the release of a second messenger that activates specific enzymes in the cell, including adrenaline
- hormones enter cells and bind directly to transcription factors, including oestrogen.