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To gauge stimulus intensity, the nervous system relies on two sources of information: The rate at which a neuron fires: A neuron firing at a faster rate indicates a stronger intensity stimulus. The action potential must propagate toward the axon terminals; as a result, the polarity of the neuron is maintained, as mentioned above. Large anions are a component of the inner cell membrane, including specialized phospholipids and proteins associated with the inner leaflet of the membrane (leaflet is a term used for one side of the lipid bilayer membrane). Which of the following is the best explanation for the difference between the middle panel and the lower panel? Most dendrites are stimulated by chemical transmission rather than electrical currents, and since an action potential is electrical, dendrites can not carry one. Which of the following statements about receptor potentials is FALSE? A. The receptor proteins - Brainly.com. A good definition of a nerve impulse is *a. a transient change in the charge on the membrane of the cell which moves along the length of the neurite. Raising substantially the internal concentration of sodium in an axon would do what to an action potential?
A potential is a distribution of charge across the cell membrane, measured in millivolts (mV). E. Neurotransmitter secretion based on a change in membrane potential. Retrieved from Encyclopedia Britannica. When the stimulus intensity increases, _______. Net inward current produced by the cell due to the influx of both K+ and Na+ ions. 128. the current flowing across the membrane through gated and non-gated channels. Sodium ions that enter the cell at the initial segment start to spread along the length of the axon segment, but there are no voltage-gated Na+ channels until the first node of Ranvier. That becomes non-functional when the membrane becomes inside positive. Which of the following responded to a chemical stimulus? Which of the following statements about receptor potentials is false. Proteins are capable of spanning the cell membrane, including its hydrophobic core, and can interact with the charge of ions because of the varied properties of amino acids found within specific domains or regions of the protein channel. ISBN: 9780323527361. Ion channel that opens when a physical event directly affects the structure of the protein. More sodium rushes in than potassium rushes out.
An AA battery that you might find in a television remote has a voltage of 1. Neural Receptors: Neural receptors are cells that receive signals from the external environment and convey these signals to the brain in the form of electrical impulses that travel rapidly along cells called neurons. One of the early signs of cell disease is this "leaking" of sodium ions into the body cells. However, they both move down their respective gradients, toward equilibrium. Which of the following blocks voltage-gated sodium channels? B. 12.4: The Action Potential. closed; inactivated; closed. The receptor potential is generated at the _______.
A. will be greater *b. will be smaller c. will be the same d. can not be determined 157. In a given neuron, action potentials are always the same size under normal conditions. The smallest unmyelinated axons. Likely generate an action potential if refractory periods have elapsed. Action Potentials Stimulus Strength Examples History 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. Benjamin Cummings; 2010. The nodes of Ranvier are _______. Which of the following statements about receptor potentials is false eyelashes. The properties shown in the figure can be measured in which of the following?
Some are opened by certain events, meaning the channels are gated. But when the level is far out of balance, the effects can be irreversible. Other sets by this creator.
The Action Potential. B. the fact that one represents a depolarization and the other represents a hyperpolarization. However, a slight difference in charge occurs right at the membrane surface, both internally and externally. Initiation of the action potential usually occurs _______of the neuron. The rapid depolarization of an axonal membrane during the rising phase of the action potential is due to a. an increase in sodium resistance. Return of the membrane potential to its normally negative voltage at the end of the action potential. To get an electrical signal started, the membrane potential has to change. Which of the following statements about receptor potentials is false answers. E. Anions migrate into the membrane interior. An action potential requires _______. Without any outside influence, it will not change. E. An inward ionic current is produced during the opening of voltage-gated sodium channels. Increasing the duration of the stimulus.
The refractory period occurs because a. the neuron cannot fire again until the membrane potential returns to below threshold. Recent flashcard sets. Electrochemical exclusion. The conversion of a stimulus to a change in membrane potential. Learn about neuroglia cells and the function of the glial cells. When that voltage becomes less negative, the channel begins to allow ions to cross the membrane (Figure \(\PageIndex{4}\)). D. Electrogenic ion pumps. D. dendrites specific to the hormone. The electrical gradient also plays a role, as negative proteins below the membrane attract the sodium ion.
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