If you file a consolidated Oregon return and have more than one affiliate doing business in Oregon or with Oregon-source income, you must complete Schedule AF and submit it with your return. Select a topic to get more tax information: 1  Corporation estimated tax.  Corporations with headquarters outside of Oregon.
All-or-none Response: Phenomenon in which a muscle fiber contracts completely when exposed to a threshold stimulus, or not at all. When a skeletal muscle is stimulated to contract by a motor neuron a minimum amount of stimulus is needed to start the process of muscle contraction.
Unlike skeletal muscle, there is no specialized connection between the nerve fiber and the smooth muscle cell. The nerve fibers essentially passes close to the smooth muscle cells and releases the neurotransmitter (which is not restricted to acetylcholine-see below) from swellings in the fiber, called varicosities.n target cells, activates the production of cGMP. NO is the major inhibitory neurotransmitter causing relaxation of smooth muscle in the GI tract, and it is a significant contributor to the relaxation of vascular smooth muscle (Ach causes release of NO in the vasculature).