Animation Assessment: Chemical Synapses
Refer to Animation: Chemical Synapses. Place the events in the correct order.(1) opening of voltage-gated calcium channels(2) change in membrane potential of the postsynaptic neuron(3) fusion of secretory vesicles with the plasma membrane of axon terminal(4) binding of neurotransmitters to receptors on the postsynaptic neuron(5) increase in cytosolic calcium levels in the presynaptic neuron(6) arrival of action potential at the axon terminal of the presynaptic neuron (6)-(2)-(1)-(5)-(3)-(4) (2)-(1)-(5)-(4)-(3)-(6) (6)-(1)-(5)-(3)-(4)-(2) (1)-(5)-(2)-(3)-(4)-(6)
(6)-(1)-(5)-(3)-(4)-(2)
Refer to Animation: Chemical Synapses. What causes the increase in cytosolic calcium that triggers the fusion of secretory vesicles to the membrane and the release of neurotransmitters into the synaptic cleft? the hyperpolarization of the membrane at the axon terminal the opening of ligand-gated calcium channels in the axon terminal membrane the release of calcium from intracellular calcium stores the change in conformation of voltage-gated calcium channels in the axon terminal membrane
the change in conformation of voltage-gated calcium channels in the axon terminal membrane
Refer to Animation: Chemical Synapses. Which answer choice could be inhibited by greatly decreasing extracellular calcium? the production of neurotransmitter by the presynaptic neuron the fusion of secretory vesicles with the presynaptic plasma membrane the opening of voltage-gated calcium channels on the presynaptic axon terminal the arrival of the action potential at the presynaptic axon terminal
the fusion of secretory vesicles with the presynaptic plasma membrane
Refer to Animation: Chemical Synapses. When an action potential reaches the axon terminal: Neurotransmitter molecules are released from the axon terminal, bind to and open the potassium channels on the cell body of the next neuron, and may initiate an action potential in that neuron. Neurotransmitter molecules are released from the axon terminal and bind to receptors on the postsynaptic neuron, causing either an inhibitory hyperpolarization or an excitatory depolarization. Calcium ions are released from the axon terminal, bind to and open the sodium channels on the cell body of the next neuron, and may initiate an action potential in that neuron. Sodium ions are released from the axon terminal, enter the cell body of the postsynaptic neuron through its sodium channels, and may initiate an action potential in that neuron.
Neurotransmitter molecules are released from the axon terminal and bind to receptors on the postsynaptic neuron, causing either an inhibitory hyperpolarization or an excitatory depolarization.
Refer to Animation: Chemical Synapses. Which answer choice determines whether or not an action potential is triggered in the postsynaptic neuron? the overall net change in membrane potential caused by the combined EPSPs and IPSPs the magnitude of the depolarizing excitatory postsynaptic potentials (EPSPs) the magnitude of the hyperpolarizing inhibitory postsynaptic potential (IPSP)
the overall net change in membrane potential caused by the combined EPSPs and IPSPs