Tag: biology

Questions Related to biology

Opening of which of the following type of channels is responsible for repolarisation of an axonal membrane?

biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

  1. $Na^+$ leaky channels

  2. $K^+$ leaky channels

  3. Voltage gates $Na^+$ channels

  4. Voltage gated $K^+$ channels

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Correct Option: A

Saltatory transmission occurs in

biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

  1. Nonmyelinated nerve fibre

  2. Myelinated nerve fibre

  3. Both

  4. None of the above

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Correct Option: B

State of complete inexcitability between polarisation and repolarisation is

biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

  1. Refractory period

  2. Synaptic delay

  3. Action potential

  4. Depolarisaion

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Correct Option: A

Afferent nerve fibres carry impulses from

biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

  1. Effector organs to CNS

  2. Receptors to CNS

  3. CNS to receptors

  4. CNS to muscles

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Correct Option: B

Nerve depolarisation is maintained by 

biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

  1. C$a^{2+}$

  2. M$g^{2+}$

  3. $K^+$

  4. CI

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Correct Option: C

Cell bodies of motor nerve fibres occur in

biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

  1. Dorsal root of spinal nerve

  2. Dorsal horn of spinal cord

  3. Ventro-lateral horn of spinal cord

  4. Ventral root of spinal cord

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Correct Option: C

In resting nerve what is true

biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

  1. 3N$a^+$ are pumped in and 2 $K^+$ pumped out

  2. 3N$a^+$ are pumped out for every 2$K^+$ pumped in

  3. There is no Na-K pump

  4. Na-K pump stops working

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Correct Option: B

Nerve impulse for hearing originates in 

biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

  1. Ear drum

  2. Auditory nerve

  3. Ear ossicles

  4. Cochlea

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Correct Option: D

Pre-excitation potential difference between outside and inside of a nerve is called

biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

  1. Reaction potential

  2. Action potential

  3. Spike potential

  4. Resting potential

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Correct Option: D

Direction of nerve impulse is reversed in junction

biology coordination generation and conduction of nerve impulse generation of nerve impulse neurons and synapses

  1. Axo-axonic

  2. Axo-dendritic

  3. Axo-dendritic-axonic

  4. None of the above

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Correct Option: A