The synaptic, cleft an intercellular gap separating the axon tip and the target neuron, is____

1 - 10

millimeter

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10 - 20

micrometer

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10 - 20

nanometer

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1

decimeter

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Solution

The correct option is C $10 - 20$ nanometer
A synaptic cleft is the space that separates the two neurons by forming a junction in between them.
Synaptic cleft is present between the two neurons-
(a) A pre-synaptic cleft
(b) A post-synaptic cleft
This synaptic cleft is a small gap present in the extra-cellular space which is $10 - 20 n m$ wide.

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Complete the statement by chossing appropriate match among the following.

$\begin{matrix} C o l u m n I & C o l u m n I I A . R e s t i n g p o t e n t i a l & 1. C h e m i c a l s i n v o l v e d i n t h e t r a n s m i s s i o n o f i m p u l s e s a t s y n a p s e s . B . S y n a p t i c c l e f t & 2. G a p b e t w e e n t h e p r e s y n a p t i c a n d p o s t s y n a p t i c n e u r o n s . C . S y n a p t i c c l e f t & 3. E l e c t r i c a l p o t e n t i a l d i f f e r e n c e a c r o s s t h e r e s t i n g n e u r a l m e m b r a n e . D . N e u r o t r a n s m i t t e r s & 4. A n e l e c t r i c a l w a v e l i k e r e s p o n s e o f a n e u r o n t o a s t i m u l a t i o n . \end{matrix}$

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

Q. Complete the statement by choosing appropriate match among the following

Column I

Column II

(a)Resting potential

i. chemicals involved in the transmission of impulses at synapses.

(b)Nerve impulse

ii. gap between the pre synaptic and post synaptic neurons

(c)Synaptic cleft

iii.electrical potential difference across the resting neural membrane

(d)Neurotransmitters

iv.an electrical wave like response of a neuron to a stimulation.

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. 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?

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