Cell Signalling and Transduction
The signaling molecules called steroid hormones

are made in one location of the body but have their effects some distance away
bind to cell surface receptors to trigger chemical cascades
never enter the blood of humans
are hydrophilic and so cannot penetrate the plasma membrane

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Cell Signalling and Transduction
When a __________ reaches its __________ , there is a specific means of receiving it and acting on the message. This task is the responsibility of specialized proteins called __________ .

kinase; receptor; proteases
signaling molecule; target cell; receptors
signaling molecule; target cell; G proteins
signaling molecule; receptor; G proteins

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