The reciprocal of the interspike interval, and measured in hertz. Which of the following occurred in the presence of tetrodotoxin? Has no effect on the time between action potentials. The membrane potential would become less negative. During the absolute refractory period of a neuron, the threshold of the neuron is extremely high because a. it can not be depolarized, due to a temporary increase in Cl- conductance.
D. The channel protein changes its primary structure in response to membrane depolarization. Which of the following is most responsible for the all-or-none property of the action potential? Increasing the duration of the stimulus. The gas constant, R. b. Capacitance. Although these classes of ion channels are found primarily in the cells of nervous or muscular tissue, they also can be found in the cells of epithelial and connective tissues. During the falling phase of an action potential, the K+ leak channel on the axon is _______, the voltage-gated Na+ channel is _______, and the voltage-gated K+ channel is _______. D. The Na+‒K+ pump actively transports Na+ out of the cell and K+ into the cell. Initiation of the action potential usually occurs _______of the neuron. Some sodium channels have been inactivated and cannot be reopened immediately.
The net current flowing across the membrane in either direction. In the presence of lidocaine, the action potential was NOT affected at R1 because _______. C Rye, R Wise, V Jurukovski, J DeSaix, J Choi, Y Avissar (2017). B. an electric current. Studied the quantitative relation between ion movements and the post synaptic potential in a squid. Answer: A. Q. Voltage-gated Na+ channels open upon reaching what state? Which of the following statements about the startle response of the cockroach is false? B. chemical stimulus. Saltatory conduction is faster because the action potential basically jumps from one node to the next (saltare = "to leap"), and the new influx of Na+ renews the depolarized membrane. Sodium permeability into the cell decreases. The cell membrane is a phospholipid bilayer, so only substances that can pass directly through the hydrophobic core can diffuse through unaided. A. P loops mediate ion selectivity.
There are differences between the nervous systems of invertebrates (such as a leech) and vertebrates, but not for the sake of what these experiments study. For example, as pressure is applied to the skin, these channels open and allow ions to enter the cell. The membrane potential at the peak of the action potential is mainly determined by the external concentration of Na+. These proteins are very specific and a very small change in a single amino acid can have an effect since these are responsible for the specific action of the protein. Which of the following is not a factor in the Nernst Equation? It is the electrical signal that nervous tissue generates for communication. Which of the following describes a change from the resting membrane potential? If a current pulse is generated on the membrane and creates a passive potential, which of the following will be true? A micropipette is used to iontophoretically adjust ion concentrations to "clamp" membrane potentials. B. the fact that one represents a depolarization and the other represents a hyperpolarization.
Most dendritic membrane cannot carry an action potential because a. it is not myelinated. This concept is known as resistance and is generally true for electrical wires or plumbing, just as it is true for axons, although the specific conditions are different at the scales of electrons or ions versus water in a river. These receptors potential are activated by a signal transduction indicating that they can respond to stimuli and convert one sensory stimuli from one form to another. To ensure the best experience, please update your browser. The frequency of action potential generation can be modified by neural input. Subjecting a neuron to a metabolic poison will over the short term not affect the ability of the neuron to conduct an action potential. B. Permeability to Na+. Potential frequency. Relative refractory period. Effectors include glands and muscles of the body which bring about the appropriate response to the stimulus. Another action potential can be generated provided the stimulus is relatively smaller than the original stimulus. Recommended textbook solutions.
147. dendrites are too small in diameter. Human Resource Management. What is the difference between the driving force for Na+ and K+? Locations on the axon where the myelin sheath is absent. And what is similar about the movement of these two ions? In two axons of the same diameter, a myelinated axon will conduct impulses faster than an unmyelinated one because a. the channels through which ions flow are larger in the myelinated axon, allowing more rapid depolarization. The process of conduction of an action potential involves the following steps *a. depolarization --> increase Na+ conductance --> increased K+ conductance and Na+ inactivation --> decreased K+ conductance. All action potentials were missing. Always generate an action potential.
Signal transmission rate is relatively fast. D. The action potential lasts about 3 ms. e. In the recovery phase, Na+ channels are closed. The potential energy of the ion imbalances across the membrane. They increase the velocity of nerve-impulse propagation. A decrease in the absolute value of the membrane potential toward zero is called. The change in the membrane voltage from -70 mV at rest to +30 mV at the end of depolarization is a 100-mV change. A. in the cell body. Looking at the way these signals work in more variable circumstances involves a look at graded potentials, which will be covered in the next section. All rights reserved.
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