Respuesta :
Arrange the events of synaptic transmission in correct sequence
(1) sodium ions diffuse into the cell and cause a local potential
(2) neurotransmitter binds with receptor on postsynaptic cell
(3) neurotransmitter diffuses across the synaptic cleft
(4) membrane permeability to sodium ions on postsynaptic cell increases
(5) action potential causes release of neurotransmitter
Answer:
5,3,2,4,1
Explanation:
The firing of an action potential at pre-synaptic neuron makes its axon terminal to release the neurotransmitters in the synaptic cleft. The released neurotransmitter molecules then bind to their receptors present at the surface of the dendrites of the postsynaptic neuron. This binding opens ion channels and allows the specific ions to enter into the postsynaptic neuron. The opening of Na+ channels allows these ions to enter into the neuron and changes the membrane potential. This changed membrane potential is called local potential and is a depolarizing graded potential.
During synapsis occurs a release of neurotransmitters from the presynaptic cell. The molecule binds its receptor in the postsynaptic cell causing a change in ion permeability. The order is option E. 5, 3, 2, 4, 1
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Neurons transmit nervous impulses.
These cells are formed by a cellular body, dendrites that receive stimuli from other cells, and an axon that conducts the electrochemical signals.
Every neuron forms connections with other neurons. These connections are known as synapsis.
- The central nervous system generates an action potential that travels to the target and activates the calcium channel in the presynaptic cell.
- Calcium triggers vesicles fusion to the presynaptic membrane. By exocytosis, vesicles release the neurotransmitter into the synaptic space.
- Once there, the neurotransmitter binds to its receptors on the postsynaptic membrane, causing ion channels to open.
- The activation of different receptors will cause a change in the postsynaptic membrane modifying the cell activity.
- Positively charged sodium ions cross the membrane to get into the postsynaptic cell and potassium leaves the cell.
- The difference in charges caused by these ions transport charges positively the cell membrane. It depolarizes.
The correct order is option E. 5, 3, 2, 4, 1
(5) action potential
(3) neurotransmitter diffuses across the synaptic cleft
(2) neurotransmitter binds with receptor on postsynaptic cell
(4) membrane permeability to sodium ions on postsynaptic cell increases
(1) sodium ions diffuse into the cell and cause a local potential
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You can learn more about synapsis at
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