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Types of Synapse

A nerve impul...

Question

A nerve impulse is transmitted from one neuron to another through junctions called synapses. Which one is not part of synapse?

A

Presynaptic membrane

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B

Synaptic cleft

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C

Post synaptic membrane

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D

Nissl's granules

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Solution

The correct option is D Nissl's granules
Neurons constitute the basic unit of the brain, and it is responsible for the transmission of impulses. The nerve impulse is transmitted from one neuron to another through junctions called synaptic junctions. The synapse contains mainly three parts: the presynaptic membrane, synaptic cleft and the postsynaptic membrane. The neurons are connected at the synaptic junctions, and the transmission of impulses occur from presynaptic neuron to the postsynaptic neuron by neurotransmitters. Nissl’s granules are not a part of the synapse, it is a part of the neuron.
So, the correct answer is 'Nissl's granules'.

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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. Question 21
Which of the following statements about transmission of nerve impulse is incorrect?

(a) Nerve impulse travels from dendritic end towards axonal end.
(b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron.
(c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron.
(d) A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.

Q. Which of these is wrong statement/s ?
(i) Neurotransmitter jumps from one junction to another.
(ii) After signal transmittance post-synaptic membrane is destroyed.
(iii) Neurotransmitter is permanently destroyed after the transmission of nerve impulse has taken place.

Q. Read the given statements and select the correct ones.
(i) Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body.
(ii) Unmyelinated nerve fibres do not have Schwann cells which from the myelin sheath.
(iii) Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K+) than to sodium ions (Na+).
(iv) A synapse is formed by the membranes of a presynaptic neuron and a post synaptic neuron.

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