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Axon endings release from ints synaptic...

Axon endings release from ints synaptic vesicles , a neuro-transmitter substance known as

A

Acetylcholine

B

Acetylcholinesterases

C

Inositol - 3 phosphate

D

Diacylglycerol

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The correct Answer is:
A
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Assertion : The chemical stored in the synaptic vesicles are termed as neurotransmitters. Reason : Synaptic vesicles release these chemicals in the synaptic cleft.

Assertion Arival of an impulse at the axon terminal stimulates the release of neurotransmitters in synaptic cleft. Reason These neurotransmitters are responible for the opening of ion channels.

Release of cheminal messenge from synaptic vesicles is triggered by

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

How many statements are correct? i. Dendrites contains Nissi's granules ii. Dendrites transmit impulse towards the cell body iii. The proximal end of axon is branched iv. Synaptic knob possess synaptic vesicles containing neurotransmitters.

Which option is correct for conduction of nerve impulse along chemical synapse? i. At synapse, the membranes of the pre and postsynaptic neurons are separated by a fluid-filled space called synaptic cleft ii. Chemicals called neurotransmitters are incolved in the transmission of impulses at these synapses iii. The axom terminals contain vesicles filled with these neurotransmitters iv. When an impulse arrives at the axon terminal, synaptic vesicles release their neurotransmitters in the synaptic cleft. v. The release neurotransmitters bind to their specific receptors, present on the pre-synaptic membrane. vi. Opens ion channels allowing the entry of ions which can generate a new potential in the postsynaptic neuron vii. The new potential developed is only excitatory

[A] : Synaptic vesicles fuse with membrane and release neurotransmitter molecules. [R]: Neurotransmitter attaches to receptor site and open sodium channels to allow so- dium to flow into post synaptic cell causing depolarisation.

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 ?

Which statements are incorrect for mechanism of nerve impulse conduction along electrical junctions of nerous or electrical synapse? i Nerve impulse flow directly from one neuron to other across the synapses in electrical synapses ii. Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon iii. Impulse transmission across an elecetrical synapse is always faster than that across a chemical synapse. iv. Electrical synapses are rare in our system v. At an electrical synapse, the membranes of the pre and post-synaptic neurous are separated by a fluid-filled space called synaptic cleft is thick. vi. Chemicals called neurotransmitters are involved in the transmission of impulses at this synapse

AAKASH INSTITUTE-NEURAL CONTROL AND COORDINATION -Assignment SECTION - B (Objective Type Questions )
  1. If the inside of membrane becomes more negative it leads to

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  2. Suppose the terminal ends of axon are in contact with dendrites of fou...

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  3. Axon endings release from ints synaptic vesicles , a neuro-transmitte...

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  4. Which part is involved in movement of head to locate and detect the s...

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  5. Which part of the brain is like a defense castle controlling moods an...

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  6. The link between paracoel and diocoel is through

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  7. The function of choroid plexus is

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  8. The branched trr like structure present in cerebellum is or The tr...

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  9. The vomiting centre is situated in

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  10. End of spinal cord is

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  11. Paralysis of jaw muscles is due to loss of function of which cranial n...

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  12. Which of the following cranial nerves in man is both sensory and motor...

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  13. Which of the following cranial nerves are linked with taste buds ?

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  14. The smallest cranial nerve in human being is

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  15. The fourth cranial nerve of man is

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  16. The number of spinal nerves in man is

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  17. The corpuscles lying deep in dermis and responsible for deep pressure ...

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  18. When the object is at a distance of more than 6 metres, at that time

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  19. In old age, the vision of eye becomes dim. It is due to

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  20. In hypermetropia, the image is formed

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