Nerve Cell

Q.

Why are neurons excitable cells?

Q. Which of the following structures in the neural tissue synthesizes proteins?

1. Myelin sheath
2. Neurofibrils
3. Synapse
4. Nissl’s granules

Q. The node of Ranvier on an axon is the

1. fine fibres in the neuroplasm
2. points devoid of myelin sheath
3. short branched processes
4. point of contact between two neurons

Q. Which of the following contains the trigger zone of the neuron?

1. Nissil’s granules
2. Dendrites
3. Axon
4. Cyton

Q. Which one of the following pairs of structures distinguishes a nerve cell from other types of cell?

1. Flagellum and medullary sheath
2. Nucleus and mitochondria
3. Perikaryon and dendrites
4. Vacuoles and fibres

Q.

Fill in the blank spaces:
In a muscle fibre Ca++ is stored in ___

Q. Nissl’s granules are

1. irregular masses of RER and free ribosomes
2. neuroglial cells that produce the myelin sheath
3. endocrine glands
4. phagocytic cells

Q.

Name the tissue that conducts messages from one part of the body to the other parts.

Q. Nissl's granules are associated with which of the following system?

1. Nervous system
2. Excretory system
3. Muscular system
4. Digestive system

Q. Which of the following contains the trigger zone of the neuron?

1. Nissil’s granules
2. Dendrites
3. Axon
4. Cyton

Q. Which of the following is a difference between neurons and glial cells

1. Glial cells

2. Dendrites

3. Neurons

4. Nissl's granules

Q.

Name them.

The protoplasmic projections arising from the cyton.

Q.

What is a nerve conduction study?

Q. The functional unit of neural system is called

1. neuroglial cell
2. osteocyte
3. myofibril
4. neuron

Q.

The structural unit of nervous system is neuron.

1. True
2. False

Q.

Nissls granules are absent in

1. Axon

2. Dendron

3. Soma

4. All of the above

Q. Read the given statements and select the correct option.
(i) Synaptic cleft of neurons secretes adrenaline.
(ii) Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(iii) Non-myelinated nerve fibre is enclosed by a Schwann cells that does not form a myelin sheath.
(iii) Spinal and cranial nerves are made of non-myelinated nerve fibres

1. Statements (i) and (ii) are correct but statements (iii) and (iv) are incorrect
2. Statements (i), (ii) and (iii) are correct but statement (iv) is incorrect
3. Statements (iii) and (iv) are correct but statements (i) and (ii) are incorrect
4. Statements (ii) and (iii) are correct but statements (i) and (iv) are incorrect

Q. Nissl’s granules are

1. irregular masses of RER and free ribosomes
2. neuroglial cells that produce the myelin sheath
3. endocrine glands
4. phagocytic cells

Q. The function of nervous tissue is

1. Irritability
2. Sensitivity
3. Responsiveness
4. Contraction

Q. Label the parts of the nerve cell.

1. Dendrites
2. Axon
3. Cell body
4. Axon terminal

Q.

Glial cells in nervous tissue help in

(i) Support (ii) Conducting impulses (iii) Nourishment (iv) Multiplication

1. (i), (ii)

2. (ii), (iii)

3. (i), (iii)

4. (ii), (iv)

Q.

Name a region where unipolar neurons can be seen.

Q. Which one of the following pairs of structures distinguishes a nerve cell from other types of cell?

1. Flagellum and medullary sheath
2. Nucleus and mitochondria
3. Perikaryon and dendrites
4. Vacuoles and fibres

Q. The longest cell in the human body is

1. nerve cell
2. skeletal muscle
3. bone cells
4. cells of the alimentary canal

Q.

The longest cells in the body are

1. Egg cells

2. Sperm cells

3. Nerve cells

4. None of these

Q. "All enzymes are proteins". This statement has been modified with the discovery of

1. Dehydrogenase
2. Arylsulphatase
3. Ribozyme
4. Nitroreductase

Q.

What are dendrites?

Q. Sarcoplasmic reticulum of muscle fibres is the storehouse of

1. Calcium
2. Sodium
3. Chloride
4. Potassium

Q. Label the parts of the nerve cell.

1. Dendrites
2. Axon
3. Cell body
4. Axon terminal

Q. Which cell organelle is absent in neuron?

1. Mitochondria
2. Ribsomes
3. Centrioles
4. Nucleus