Neuron

Q.

Node of the Ranvier is the place where

1. Myelin sheath and neurilemma are discontinuous

2. Axolemma is absent

3. Axolemma is discontinuous

4. Myelin sheath is discontinuous

Q.

The part of neuron which encloses mitochondria and helps in maintainance of nerve cell is ____________.

1. cell body

2. synapse

3. axon terminals

4. all dendrites

Q.

The extension of the cyton of a neuron which carries electric impulses forward is ___________.

1. dendrite

2. axon and dendrites

3. axon

4. dendrites and nucleus of cyton

Q. Smallest cranial nerve in humans is

1. Optic
2. Olfactory
3. Oculomotor
4. Pathetic

Q. Bundle of neurons or axons is known as?

1. Neuron
2. Axons
3. Nerve
4. Nervous system

Q.

___________ of neuron release ____________ which helps in effective and perpeptual flow of nerve impulses.

1. Dendrite and amino acids

2. Axon ends and adrenaline

3. Axon terminals and acetylcholine

4. Axon and myelin of myelin sheath

Q. Chemical messengers responsible for control and coordination in plants and animals are:

1. Blood
2. Plasma
3. Hormones
4. Saliva

Q.

Which of these categories do spinal nerves come under?

1. Interneurons

2. Motor neurons

3. Sensory neurons

4. Mixed Nerve

Q. Nerve cells have many short branches called as___________

1. Dendrites
2. Neurons
3. Axons
4. Neutrophils

Q. What is the correct direction of flow of electrical impulses?

1. 
2. 
3. 
4. 

Q. Axon ends in _______.

1. nodes of ranvier
2. axon terminals
3. dendrites
4. cyton

Q. Which of the following statement about transmission of nerve impulse is incorrect?

1. Nerve impulse travels from dendritic end towards axonal end.
2. 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.
3. 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.
4. A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.

Q.

Which part of neuron is made up of electrically insulating material?

1. Cell body

2. Axon

3. Dendrite

4. Myelin sheath

Q. Which of the following statement is/are true?
(i) Sudden action in response to something in the environment is called as a reflex action.
(ii) Sensory neurons carry signals from the spinal cord to muscles.
(iii) Motor neurons carry signals from receptors to the spinal cord.
(iv) The path through which signals are transmitted from a receptor to a muscle or a gland is called as reflex arc.

1. (i) and (iv)
2. (i), (ii) and (iii)
3. (i) and (iii)
4. (i) and (ii)

Q. Dendrites are present on the

1. Axon ends
2. Cyton
3. Dendrites
4. Myelin sheath

Q. Which of these categories do spinal nerves come under?

1. Motor neurons
2. Sensory neurons
3. Interneurons
4. Mixed Nerve

Q. Through the neuron, information travels as an

1. Electrical impulse
2. Mechanical impulse
3. chemical impulse
4. None of the above

Q. What are nociceptors and its function ?