Explain the use acetylcholine as a neurotransmitter?

Identify the role of potassium in the propagation of an action potential and predict how a severe deficit of potassium in the body could affect muscle function

John Hughes and Hans Kosterlitz identified the endorphin receptor in frogs, and concluded that animals have a "built in" opioid system. To make sure that endorphins are truly neurochemicals, which of the following question should we ask these gentlemen? Please select all that apply.a) Are endorphins released in response to presynaptic depolarization? b) Do endorphins interact with postsynaptic receptors? c) Are endorphins found in presynaptic cells? d) Are endorphins subject to reuptake?

Explain phenomenon of constitutive activity, and how inverse agonists produce their effect.