Types of Cell Signalling


(1) Endocrine: -Hormones produced by endocrine glands

-Send through blood stream to target cells

-E.g. Progesterone and Testosterone 

-Generally regulate transcription or water soluble molcules that bind to receptors on the plasma membrane e.g. Insulin/Glucagon 

(2) Paracrine: -Signalling molecule affects only target cells in the proximity of the signalling cell



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