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Synapse

Synapse is th...

Question

Synapse is the site for impulse transmission between the of a pre-synaptic neuron and the of the post-synaptic neuron.

A

cell body

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B

dendrite

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C

axon terminal

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D

axon

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Solution

The correct options are
B dendrite
C axon terminal
Synapse is the site in which impulse transmission takes place between the axon terminals of a pre-synaptic neuron and the dendrites of the post-synaptic neuron separated by a fine gap.
There are two types of synapses - electrical and chemical. In electrical synapse, electrical charges help in impulse transmission. In chemical synapse, chemicals called neurotransmitters help in impulse transmission.

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Q. Synapse is the site for impulse transmission between the of a pre-synaptic neuron and the of the post-synaptic neuron.

Q. 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?

Q. Assertion: Transmission of the nerve impulse across a synapse is accomplished by neurotransmitters.
Reason: Transmission across a synapse usually requires neurotransmitters because there is small space i.e. synaptic cleft, that separates one neuron from another.

Q. ln electrical synapse, impulse from pre-synaptic membrane reaches post-synaptic membrane through:

Q. Which of the following statements is/are incorrect about the electrical synapse?
(i) At electrical synapses, the membranes of pre and post synaptic neurons are in very close proximity.
(ii) Electrical current can flow directly from one neuron into the other across the synapses.
(iii) Transmission of an impulse across electrical synapses is very similar to impulse conduction along single axon.
(iv) Electrical synapses pass electrical signal between cells with the use of Ach.
(v) Electrical synapses are fast.
(vi) Electrical synapses are rare in our system.

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