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- Synaptic terminal Neurotransmitter SENDING NEURON Vesicle Calcium channel Receptor for neurotransmitter RECEIVING NEURON Synaptic cleftIf 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 AirRegardless of type, all neurons transfer signals between each other or to effectors (muscles or glands) at a synapse. The neuromuscular junction that we talked about with the muscular system is one example of a synapse. The diagram below shows the general features of a synapse Match each term or description with the appropriate letter in the diagram. You may use terms more than once. 1. Synaptic knob in axon terminal of pre-synaptic cell: 2. Synaptic cleft: 3. Neurotransmitter: 4. Dendrite of post-synaptic cell: 5. Cell body of post-synaptic cell: 6. Receptor in plasma membrane of post-synaptic cell: 7. Chemical released by neurons that stimulates or inhibits other neurons, muscles, or glands: 8. Cell that sends the signal: 9. Dendrite of cell that receives the signal: 10. Space between cells that must be crossed by neurotransmitters: 11. Structure that opens, like a "protein door", when neurotransmitters attach to it:
- Synaptic transmission depends upon :- a-direct transmission of impulses from the presynaptic neuron to the postsynaptic neuronb- diffusion of neurotransmitters from synaptic knobs into the soma and dendrites of postsynaptic neuronsc- presence of voltage-gated Ca ++ channels in membrane of synaptic knobsd- presence of voltage-gated Ca ++ channels in the subsynaptic membraneConnexons 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 hyperpolarizedIf a post synaptic neuron is stimulated to threshold by spatial summation this implies that the post synaptic cell has a lower than normal threshold the postsynaptic cell has many synapses with many presynaptic neurons the post synaptic cell is getting stimulated many times during a short period of time by a single presynaptic neuron the post synaptic cell is slow to repolarize
- F G A E ||| СPlace 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.Synaptic fatigue is due to : -a- decreased synthesis of neurotransmittersb- inability to release neurotransmitters by exocytosisc- failure of action potentials to open voltage-gated Ca ++ channels in presynaptic terminald- imbalance in between rates of synthesis and release of neurotransmitters
- Arrange the events that occur during synaptic transmission. Use letters A-F to denote the correct sequence. Use the diagram on the right as a clue. Example: SENDING NEURON B 1. lon channel opens Synepto SYNAPSE 1. lon channel opens 2. Neurotransmitter is released into synaptic cleft SYNAPTIC CLEFT RECEVING HEURC4 Neurotransmitter 3. Vesicle fuses with plasma membrane Jon chennels Neurotransmtter Reseptor deurotranemitter brohen down and sa sd 4. Neurotransmitter binds to receptor BOns 前 命 5. Action potential arrives 6. lon channel closes the obeicos in the bo y belo M (A nAnatomically, the motor endplate potential is characterized by synaptic boutons active zones junctional folds Ach receptor-channels all the aboveNerve 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