How do only certain cells respond to particular signaling molecules that may be sent throughout the body? see section 11.3 (page 244) . view available hint(s) how do only certain cells respond to particular signaling molecules that may be sent throughout the body? see section 11.3 (page 244) . they express the appropriate g protein. they express the appropriate second messenger(s). they express the ras protein. they express the appropriate receptor?