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Do you know how the pre-synaptic neuron ...

Do you know how the pre-synaptic neuron transmits an impulse (action potential) across the synaptic cleft to the post-synaptic neuron?

Text Solution

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Chemicals called neurotransmitters are involved in the transmission of impulses at these synapses. The axon terminals contain vesicles filled with these neurotransmitters. When an impulse (action potential) arrives at the axon terminal, it stimulates the movement of the synaptic vesicles towards the membrane where they fuse with the plasma membrane and released their neurotransmitters in the synaptic cleft. The released neurotransmitters bind to their specific receptors, present on the post-synaptic membrane. This binding opens ion channels allowing the entry of ions which can generate a new potential in the post-synaptic neuron.
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[A] : In mammals, ends of presynaptic fibres are enlarged to form synaptic Knobs which are separated by a synaptic cleft from postsynaptic neurons. Each synaptic knob contains many mitochondria and small gran- ule-Iike synaptic vesicles filled with minute packets of the chemical that transmits im- pulses to postsynaptic neurons. [R]: The chemical transmitters are called neurohumors which proportionate to K^+ in- flux.

How do nerve impulses on a neuron travel only in one direction?

in electrical synapse, impulse from presynaptic membrane reaches post-synaptic membrane through

A : Transmission of the nerve impulse across a synapse is accomplished by neurotransmitters . R : Transmission across a synapse usually requires neuro transmitters because there is space , i.e., synaptic cleft, that separates one neuron from another .

A : Transmission of the nerve impulse across a synapse is accomplished by neurotransmitters . R : Transmission across a synapse usually requires neuro transmitters because there is space , i.e., synaptic cleft, that separates one neuron from another .

A : Transmission of the nerve impulse across a synapse is accomplished by neurotransmitters . R : Transmission across a synapse usually requires neuro transmitters because there is space , i.e., synaptic cleft, that separates one neuron from another .

Synaptic bulb is the junction between two neurons.

What is the action potential of a neuron ? Do all neurons possess the same action potential ?

Knowledge Check

  • A list of events occurring in the transmission of nerve impulse across the synapse is given below in a random order (i)Opening of specific ion channels allows the entry of ions, a new action potential is generated in the post-synaptic neuron. (ii)Neurotransmitter binds to the receptor on post synaptic membrane. (iii)Synaptic vesicle fuses with pre-synaptic membrane, neurotransmitter release into synaptic cleft. (iv)Depolarisation of pre-synaptic membrane. (v)Arrival of action potential at axon terminal. Which of the following options represents these events in a correct order ?

    A
    `(v)to(iv)to(iii)to(ii)to(i)`
    B
    `(i)to(ii)to(iii)to(iv)to(v)`
    C
    `(i)to(ii)to(iv)to(iii)to(v)`
    D
    `(v)to(iv)to(iii)to(i)to(ii)`

  • The given diagram shows axon terminal.Select the option that correctly matches the steps in transmission of impulses (list i-vii) with the labellings (A-C) in diagram. (i)Chemicals called neurotransmitters are released in the synaptic cleft through ion channels. (ii)When an impulse arrives at the axon terminal, it stimulates the movement of synaptic vesicles. (iii)Neurotransmitters are endocytosed into the neurons. (iv)The ions channels close with the binding of neurotransmitters to their specific receptors vesicles. (v)Synaptic vesicles move towards the membrane where they fuse with the plasma membrane. (vi)Neurotransmitters are released in the synaptic cleft. (vii)The released transmitters bind to their specific receptors on post-synaptic membrane

    A
    `{:(A," "B," "C),((ii)""," "(iii)" "," "(i)) :}`
    B
    `{:(A," "B," "C),((v)""," "(vi)" "," "(iv)) :}`
    C
    `{:(A," "B," "C),((ii)""," "(vi)" "," "(vii)) :}`
    D
    `{:(A," "B," "C),((v)""," "(iii)" "," "(iv)) :}`