What are the 4 primary receptor families?
Cell membrane embedded enzymes, ie growth factors and insulin
Ligand-gated ion channels: “Transducers," Amplify signals received
G protein-coupled receptor systems: Can stimulate or inhibit a wide array of activities
Transcription factors: Requires hours to days for full effect because it is a complex system which starts with increasing transcription of DNA--> RNA, then RNA--> amino acids/proteins, then circulation, then finally proteins binding to their target receptors. ie Thyroid hormone