Nerve Impulse Conduction

Q.

Draw a labelled diagram of a neuron.

Q.

What are electrical impulses ? How they are produced?

Q.

Which of the following is a neurotransmitter released exclusively into the neuromuscular synapse?

1. Dopamine

2. Epinephrine
   

3. Acetylcholine
   

4. Norepinephrine

Q. Function of myelinated and non myelinated neuron?

Q.

Draw a labelled diagram of neuron and label any four different parts explain.

Q. What is the refractory period?

1. The period during which an action potential occurs
2. The period soon after an action potential passes
3. The duration when an action potential will not fire regardless of the strength of the stimulus.
4. The period of membrane depolarization before it reaches threshold potential.

Q.

How do you call the conduction of impulse along a myelinated nerve fibre.

Q.

What does a neuron look like?

Q.

What are the limitations of electric impulses?

Q.

The nature of nerve impulse conduction is _______.

1. electrical

2. chemical

3. thermal

4. electrochemical

Q.

Is ATP utilized in transport of glucose?

Q. Match the following parts of a neuron to their respective functions.

Parts of Neuron	Functions
(A) Dendrite	(i) Insulates axon
(B) Axon	(ii) Recieves impulses
(C) Myelin sheath	(iii) Conducts impulses

1. A-ii;B-iii;C-i
2. A-i;B-iii;C-ii
3. A-iii;B-ii;C-i
4. A-iii; B-i; C-ii

Q.

what is meant by nerve impulse?

Q. If a part of an axonal membrane becomes more permeable to ${\mathrm{Na}}^{+}$ ions, the membrane becomes .

1. hyperpolarised
2. depolarised
3. polarised

Q. Membrane potential is due to the distribution of ions between the inside and the outside of the cell.

1. even
2. uneven
3. parallel
4. unique

Q.

What are the limitations of electrical impulse.

Q.

Answer the questions:

1) What happens at the synapse between two neurons?

2) Which part of the brain maintains posture and equilibrium of the body?

3) How do we detect the smell of an agarbatti (incense stick)?

4) what is the role of the brain in reflex action?

Q. The jumping of action potential from node to node (of Ranvier) in a fibre is called ___.

1. Nodal conduction
2. All or none principle
3. Threshold stimulus
4. Salutatory conduction.

Q.

In a neuron, the part known as ______ send signals away from neurons whereas ______ receive signals from other neurons.

1. Dendrites, Axon

2. Synapses, Dendrites

3. Axon, Synapses

4. Axon, Dendrites

Q.

Transmission of a nerve impulse is bidirectional.

1. Bidirectionsl

2. Unidirectional

Q.

Which of the following recieves an external stimulus and generates an impulse in response?

1. Receptors

2. Effector

3. Hormones

4. Spinal cord

Q. A resting membrane is and has a membrane potential of

1. 70 mv
2. polarised
3. depolarised
4. -70 mv

Q.

The conduction of impulses through a myelinated fiber is called saltatory conduction.

1. False

2. True

Q.

Electrical impulses travel from cyton to ____________.

1. Dendrite

2. Dendrites and nucleus of cyton

3. Axon and dendrites

4. Axon

Q.

Which of the following is true for nerve impulses?

1. They are electrochemical in nature.

2. They are self-propagating.

3. They are transmitted rapidly.

4. All of these

Q.

Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that:

1. A nerve fibre is insulated by myelin sheath which ensures unidirectional flow.

2. Neurotransmitters are naturally attracted towards the brain.

3. Neurotransmitters are released by dendrites and not by axon endings.

4. Neurotransmitters are released by the axon endings and not by dendrites.

Q.

In a nerve impulse, the electrical impulse is caused by:

1. Compounds

2. Molecules

3. Ions

4. Atoms

Q.

Velocity of nerve impulse is

1. 1000 meter/second

2. 100 meter/second

3. 50 meter/second

4. 130 meter/second

Q.

The conduction of the nerve impulses through the neurons is similar to the conduction of electricity through a wire.

1. True

2. False

Q. In neuron, _______ is present inside the cell body.

1. axon
2. dendrite
3. nucleus
4. synapse