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- Stellate cells initially process sensory input to the cortex, whereas pyramidal cells send fibers from the cortex to terminate on efferent motor neurons. (True or false)Assume presynaptic excitatory neuron A terminates on a postsynaptic cell near the axon hillock and presynaptic excitatory neuron B terminates on the same postsynaptic cell on a dendrite located on the side of the cell body opposite the axon hillock. Explain why rapid firing of presynaptic neuron A could bring the postsynaptic neuron to threshold through temporal summation, thus initiating an action potential, whereas firing of presynaptic neuron B at the same frequency and the same magnitude of EPSPs may not bring the postsynaptic neuron to threshold.When action potentials arrive at a synapse between a neuron and another cell, they stimulate the release of molecules of a ________ that diffuse over to that cell.
- A neuron responds to adequate stimulation with _______, a type of self-propagating signal.Figure 35.11 Potassium channel blockers, such as amiodarone and procainamide, which are used to treat abnormal electrical activity in the heart, called cardiac dysrhythmia, impede the movement of K+ through voltage-gated K+ channels. Which part of the action potential would you expect potassium channels to affect?If action potential propagation from one neuron to another neuron requires ACh release, what event at the synaptic cleft explains the need for action potentials to arrive at a high rate before the post-synaptic membrane achieves threshold? the lack of sodium voltage gated channels on the post-synaptic membrane O the rapid breakdown of ACh by ACHE at the synaptic cleft the slow release of ACh by the synaptic vessicles the slow movement of sodium through chemical gates Previous Next MacBook Air
- You have bunch of neurons in alive in a dish. You are recording from the axon hillock of one neuron while you stimulate an action potential in another neuron that synapses on the neuron you are recording from. One action potential from your presynaptic neuron causes +5 mV depolarization in the postsynaptic neuron’s axon hillock. Threshold for this neuron requires +10 mV. How can you most assuredly achieve threshold for this post-synaptic neuron? Group of answer choices Firing the presynaptic neuron multiple times in close succession Firing the presynaptic neuron plus another random presynaptic neuron that you find in the dish You can’t a +5mV EPSP will never be able to reach a 10mV threshold Firing the presynaptic neuron multiple times but keep the firing events spaced out really far in time.Place the following actions of synaptic transmission in the correct order: 1. voltage-gated Ca+2 synaptic terminal of presynaptic cell channels open on 2. voltage-gated Nat channels open on axon of presynaptic cell 3. neurotransmitter released via exоcytosis 4. chemical-gated channels open on post- synaptic cell A 1, 2, 3, 4 В 2, 3, 4, 1 C 2, 1, 3, 4 D 4, 2, 1, 3 3, 4, 2, 1 6.Which of the following does NOT contribute to the establishment or maintenance of the neuron resting membrane potential? Oa sodium and potassium ions are actively transported across the cell membrane which maintains the resting membrane potential Ob. negatively charged proteins are inside the neuron and are not transported out Oc potassium ions are highly concentrated outside the cell and their are many potassium leakage channels in the membrane Od. sodium ions are more highly concentrated outside the cell and there are fewer sodium ion leakage channels in the membrane
- Which is TRUE about neuronal membrane electrical and concentration gradients at the peak of the action potential? The electrical gradient is in a direction that would tend to move K+ out of the cell. The concentration gradient for K+ is in a direction that would tend to move it into the cell. O The concentration gradient for K+ greatly increases compared to at rest. The concentration gradient for Na+ is in a direction that would tend to move it out of the cell. O The electrical gradient for Na+ is in a direction that would tend to move it into the cell.Which of the following statements are true with regards to the differences between a neuromuscular junction, and a standard central nervous system (CNS) synapse? Select all that apply. O The neuromuscular junction is a synapse between a neuron (alpha motor neuron) and a muscle fibre. CNS synapses connect two neurons. The graded potential generated by a neuromuscular junction has a much larger voltage than that of a CNS synapse. The structure of the neuromuscular junction ensures that an action potential in the alpha motor neuron always results in an action potential in the post-synaptic muscle fibre. CNS synapses do not guarantee this. The neuromuscular junction always uses Acetylcholine as a neurotransmitter, whereas CNS synapses may use a variety of neurotransmitters depending on their location and functionA neuron has a resting membrane potential of -70 milivolts (mV) and a threshold value of -55 mV. Three synapses on the body of this neuron receive the impulses listed below. hyperpolarisation by 5 mV • depolarisation by 15 mV • depolarisation by 10 mV ENTER THE MEMBRANE POTENTIAL AS A NUMBER WITH + OR - IN FRONT OF IT. The final membrane potential will be mV and this cause an action potential becasue it is v than the