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- Neuroscience Question: Which of the following statements ACCURATELY describe spinal cord organization. α-motor neurons are organized from lateral to media such that those found towards the medial section of the spinal cord controls the distal muscles. Lumbar spinal cord enlargement is observed where neurons that innervate the legs and feet are located Neuronal cell bodies (somas) of neurons that innervate single muscles are only found in a single spinal cord segment. Muscles of the trunk are represented medially while muscles of arms and hands are represented laterally Group of answer choices 1, 2, 4 2, 3, 4 2, 4 4 only 1,2,3,4 Here is my reasoning: Please you be the judge if this is correct! α-motor neurons are organized from lateral to medial such that those found towards the medial section of the spinal cord control the distal muscles. This is inaccurate. α-motor neurons are organized from medial to lateral in the spinal cord, with those medially controlling axial…Excitatory 3 neurons A,B,C, all synapse with neuron D. Neuron A,B release a neurotransmitters, and C release the same type plus neuromodulator that produce EPSPs in neuron D. Action Potential which produced in A,B, C Neurons. Which results in more action potentials in neuron D, stimulation by only A or B or C? ExplainInterneuron after-discharge circuits prolong the duration of :-a- sensory input to the spinal motor centersb- synaptic delay in central synapsesc- discharge of efferent neuronsd- conscious perception of the evoked sensation
- Connexons of gap junctions in electric synapses :-a- are Ligand-gatedb- are voltage-gatedc- allow transmission of potential changes in both directions between the pre- and post- synaptic neuronsd- close whenever the presynaptic neuron becomes hyperpolarizedMetaNeuron Lesson 4 1. Action Potential Threshold. Vary the amplitude of "Stimulus 1". What effect does this have on the cell response (Figure 7)? What is the threshold stimulus amplitude (in uA) for initiating an action potential? The threshold stimulus is best measured by adjusting the stimulus amplitude in 0.1 µA increments until it is just large enough to initiate an action potential. Click on the "Stimulus 1 Amplitude" gray button and move the mouse while holding down the ctrl key. 2. Action Potentials and the Na+ equilibrium potential. Set "Stimulus 1 Amplitude" to 150 μA. The stimulus will evoke an action potential. Vary the "Na+ equilibrium potential". What effect does this have on the action potential? Why? 3. Action potentials and gK max. Using a "Stimulus 1 Amplitude" of 150 μA and a "Na+ equilibrium potential" of 50 mV, vary "gK max". What effect does this have on the time to action potential initiation and the width of the action potential? Why? 4. Na+ channels and Action…FILL IN BLANKS smoothstriatedmany cellsone cell per fiberbranchedlong, straightspindle-shapedautorhythmicinvoluntary/autonomicvoluntary/somatic motor
- Co-activation of α and γ-motor neurons :-a- increases γ-motor neuron discharge whenever the activity of α-motor neurons rises to a high levelb- is mediated by interneurons that link the α and γ-motor neuronsc- maintains the proprioceptive information to higher centers during muscle contractiond- increases the α-motor neuron discharge whenever the activity of γ-motor neurons rises to a high levelWatch this video (http://openstaxcollege.org/l/motorpathway) to learn more about the descending motor pathway for the somatic nervous system. The autonomic connections are mentioned, which are covered in another chapter. From this brief video, only some of the descending motor pathway of the somatic nervous system is described. Which division of the pathway is described and which division is left out?Skeletal muscles are controlled by ______ . a. sympathetic neurons b. parasympathetic neurons c. somatic motor neuron d. somatic sensory neurons
- What chemicals is released by the axon terminals of a motor neuron at a neuromuscular junction? a. ACh b. serotonin c. dopamine d. epinephrineSkeletal muscles are controlled by _________ a. sympathetic neurons b. parasympathetic neurons c. somatic nerves d. both a and bNerve transmission and communication with other neurons. DI it restores the membrane potential the chemical that talks between one neuron and the other neuron the point between the neuron and the muscle transmits impulse to dendrite it carries receptors on its surface it produces the neurotransmitter 1. Neurotransmitter 2. Presynaptic membrane 3. Postsynaptic membrane 4. Nat-K+ pump 5. Neuromuscular junction 6. Axon
