Can be graded with stimulus intensity. Exercise \(\PageIndex{1}\). 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. Currents due to the presence of the action potential spread farther along the length of the myelinated axon before they cause generation of a new action potential. The rate at which a neuron can fire is determined by its absolute refractory period, which is the period of time after a cell fires, during which it cannot generate another action potential regardless of the stimulus's intensity. Suprathreshold for all of the axons. Sodium is flowing out of the cell. D. Microglial cells. Which of the following is probably going to propagate an action potential fastest? 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. The receptor potential is the change that occurs in a sensory neuron in response to an action potential. Which of the following statements about receptor potentials is false. After that, the inactivation gate re-opens, making the channel ready to start the whole process over again.
In order for ion channels to open, receptor proteins usually need to be activated. Once the threshold has been reached to trigger an electrical impulse, the nerve fires and transmits the sensory information. Answer: A. Q. Voltage-gated Na+ channels open upon reaching what state? A. graded potential.
Sodium conductance changes more slowly than does potassium conductance as membrane potential changes. D. It is a function of the insulating properties of the membrane. If you need a calculator click here. Hydrophobic amino acids are found in the domains that are apposed to the hydrocarbon tails of the phospholipids. 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). The voltage across the membrane due to ion concentration differences. D. A decrease in the concentration of anions inside the membrane. C. Redistribution of charges during a current pulse. Discovery of the All-or-None Law The all-or-none law was first described in 1871 by physiologist Henry Pickering Bowditch. Which of the following statements about receptor potentials is fale conosco. What ion enters a neuron causing depolarization of the cell membrane? D. At the metathoracic ganglion, the interneurons synaptically excite leg motor neurons. Decreases the conduction velocity of action potentials in that axon. They integrate cell membrane potentials to enhance or inhibit action potentials.
Halving the external sodium concentration around a neuron would do what to an action potential? Any depolarization that does not change the membrane potential to -55 mV or higher will not reach threshold and thus will not result in an action potential. The ionic basis for an action potential is usually the opening of a. Na+ channels alone. Learn about our editorial process Updated on November 17, 2022 Medically reviewed Verywell Mind articles are reviewed by board-certified physicians and mental healthcare professionals. As the membrane potential reaches +30 mV, other voltage-gated channels are opening in the membrane. 12.4: The Action Potential. B. an electric current. This voltage would actually be much lower except for the contributions of some important proteins in the membrane. Nerve cells in the central nervous system include interneurons (association neurons) and various types of neuroglia. Longer stimuli will allow for _______. B. closed; inactivated; closed.
The net current flowing across the membrane in either direction. B. Ions flow in intracellular fluid, carrying current to more distant parts of the membrane.
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