Concept explainers
1. When a neuron is not generating an action potential, its membrane (the neurolemma) has a resting membrane potential. During rest, are gated Na+ and K+ channels (open? closed?)
___________________________________.
2. Only cells with “excitable membranes” can create action potentials. The two types of cells in the body that can do this are?
___________________________________ and ___________________________________.
3. Which event pushes a membrane further away from being able to generate another action potential: (hyperpolarization/depolarization /repolarization)?
___________________________________.
4. Short-lived, localized changes in polarity in the membrane of a neuron are called?
___________________________________.
5. During depolarization, which channels are open , Na+ or K+?
___________________________________.
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- 1. Why does the action potential not go back to where it came from? (Multiple answers possibly) the absolute refractory period prevents this from happening Sodium voltage gated ions in the area where the action potential just came from are fully activated or inactivated Sodium voltage gated ions bind to the Na+ ions, preventing them from diffusing backwards Na+ only diffuses forward in the axon 2. When neurotransmitter binds to _______________ at the dendrites, it results in a _____________ potential Ligand gated ion channels | action Voltage gated ion channels | action Voltage gated ion channels | graded Ligand gated ion channels | gradedarrow_forwardNeurons have three main components. Describe the function of each one a. Dendrites b. Cell body c. Axon i. Myelin sheetarrow_forwardIn a nerve cell, the function of the myelin is to Group of answer choices 1. increase the speed at which nerve impulses are carried away from the cell body. 2. receive impulses and conduct them to the cell body. 3. support and nourish the neuron. 4. attach the neuron to connective tissue. 5. conduct impulses away from the cell body.arrow_forward
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- Fill in the blank: Myelin contains a high proportion of _______________________.arrow_forwardplease answer the question underlinedarrow_forwardlabel these on knee jerk reaction Multipolar neuron cell body/somaUnipolar neuron cell body/somaDorsal horn of spinal cordVentral horn of spinal cordMotor neuron cell bodyOligodendrocytesSchwann CellsSynapse Part 2EPSPCalcium (Ca2+) channelsPresynaptic neuronPostsynaptic neuronSpecific neurotransmitters (which neurotransmitters are involved in this reflex?)Receptor subtypes (which receptor subtypes are involved in this reflex?)arrow_forward
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