The all-or-none law is a principle that states that the strength of a response of a nerve cell or muscle fiber is not dependent upon the strength of the stimulus . If a stimulus is above a certain threshold, a nerve or muscle fiber will fire.
What is the all-or-none response quizlet?
all-or-none-response. The phenomenon that a muscle fiber will only contract to its full extent . threshold stimulus . The minimal strength of a stimulus to cause a contraction . You just studied 21 terms!
What does the all or none law state quizlet?
The all-or-none law is the principle that the strength by which a nerve or muscle fiber responds to a stimulus is independent of the strength of the stimulus . If the stimulus exceeds the threshold potential, the nerve or muscle fiber will give a complete response; otherwise, there is no response.
Which of the following represents the all-or-none law?
Which of the following represents the all-or-none law? The size of the action potential is independent of the strength of the stimulus that initiated it. a neuron produces an action potential of maximal strength, or none at all.
What is referred to as an all or nothing event?
Action potentials are considered an “all-or nothing” event, in that, once the threshold potential is reached, the neuron always completely depolarizes. Once depolarization is complete, the cell must now “reset” its membrane voltage back to the resting potential.
What is an example of all or none response?
A type of response that may be either complete and of full intensity or totally absent, depending on the strength of the stimulus; there is no partial response. For example, a nerve cell is either stimulated to transmit a complete nervous impulse or else it remains in its resting state; a stinging ... ...
What is a synapse?
The synapse, rather, is that small pocket of space between two cells, where they can pass messages to communicate . A single neuron may contain thousands of synapses. In fact, one type of neuron called the Purkinje cell, found in the brain’s cerebellum, may have as many as one hundred thousand synapses.
Which of the following is consistent with the all or none law quizlet?
Which of the following is consistent with the “all-or-none” law? The action potential is produced whenever the membrane potential reaches threshold . The fact that an AP occurs when threshold is reached but not below the threshold is consistent with the notion of all-or-none.
What channels open or close in response to physical distortion of the membrane surface?
A mechanically-gated channel opens because of a physical distortion of the cell membrane. Many channels associated with the sense of touch are mechanically-gated. For example, as pressure is applied to the skin, mechanically-gated channels on the subcutaneous receptors open and allow ions to enter (Figure 12.5. 3).
What is threshold stimulus quizlet?
a threshold stimulus is the minimum amount of energy needed to make a muscle fiber contract .
What is the all or none law with respect to action potential quizlet?
The all-or-none law is the principle that the strength by which a nerve or muscle fiber responds to a stimulus is independent of the strength of the stimulus . If the stimulus exceeds the threshold potential, the nerve or muscle fiber will give a complete response; otherwise, there is no response.
What is the meaning of all or none?
[ ôl′ər-nŭn′ ] Characterized by either a complete response or by a total lack of response or effect , depending on the strength of the stimulus.
Why are action potentials all or none?
The action potential is said to be all-or-nothing because it occurs only for sufficiently large depolarizing stimuli , and because its form is largely independent of the stimulus for suprathreshold stimuli. In some neurons, a single action potential can be induced by the offset of a hyperpolarizing stimulus (Fig.
Why are action potentials said to be all or none quizlet?
What does it mean, that action potentials are all or none? The action potential will be the same size, no matter what the size of the triggering stimulus, as long as threshold is reached .
Which type of synapse is most common in the nervous system?
Axodendritic synapses are the commonest type of synapse in the CNS and are described fully in Chapter 6, p. 110. Axosomatic synapse: here the axon synapses directly with the soma – these may be excitatory or inhibitory.
Do all muscles follow all or none principle?
Complete answer: All or none law is not applicable for Whole skeletal muscle . The law which is known as all-or-none law is the principle that tells us that the strength by using which a nerve or muscle cell will be responding to the stimulus is independent of the strength which stimulus has.
