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.
For example, the force of muscle contraction required to lift a 5 kg weight is less than the force required to lift a 25 kg weight, and the effort of muscles used in walking on level ground is less than the effort those same muscles expend in climbing stairs.ach muscle fiber is supplied by a single motor nerve fiber that initiates and controls the contraction of the muscle fiber. One motor nerve fiber controls several muscle fibers simultaneously. The motor nerve fiber and all of the muscle fibers it controls is called a motor unit (Fig. 1.1).