Unit 1 - Topic 4 - Communication and signalling - Section A - Co-ordination Flashcards
How do multicellular organisms signal between cells
Using extracellular signalling molecules
Examples of extracellular signalling molecules include
Steroid hormones, peptide hormones, and neurotransmitters
What are receptor molecules of target cells
Proteins with a binding site for a specific signal molecule
What does binding do
Binding changes the conformation of the receptor, which initiates a response within the cell
Why do signalling molecules have different effects on different target cell types
Differences in the intracellular signalling molecules and pathways that are involved.
In a multicellular organism what may different cell types show
A tissue-specific response to the same signal