Physiology All of the following are involved in the transmission of regulatory signals through the ECF, EXCEPT: A G protein coupled receptors B Direct contact through gap junctions C Endocrine signals through hormones D Synaptic signals through neurotransmitters 💡 Explanation All of the following are involved in the transmission of regulatory signals through the ECF, EXCEPT: ✓ Correct Answer: B. Direct contact through gap junctions