Advertisements
Advertisements
प्रश्न
With the help of a suitable diagram describe the structures of a neuron.
उत्तर
Nervous system consists of special cells called nerve cells or neurons. It has a main cell body called cyton. It gives out many processes called dendrites. From it a very long process is given out. It is called axon or nerve fibre.
The cell body has a nucleus. The dendrites get the message from the organs and send this message to the axon through the cell body. Then the axon sends the message to muscles to contrast or to the gland for secretion.
The neurons make contact with one another through their processes. The axon at its end branches and meets the dendrites of another neuron. The meeting point is called synapse. The message is passed on from one axon to the dendrites of another neuron. How the message goes ? It is like this:
Organ → Message goes to dnedrites → Cell body → Axon → Muscles or glands
APPEARS IN
संबंधित प्रश्न
Draw neat and labelled diagrams of a myelinated neuron
Mention the exact location of Malleus
Define the term Motor neuron.
Differentiate between:
Rods and Cones.
Draw a labeled diagram of a myelinated neuron.
____________ are the building blocks of the nervous system.
Identify the odd item from the following series of words.
Compare and contrast.
Sympathetic Nervous System and Parasympathetic Nervous System
Assertion: The imbalance in concentration of Na+, K+ and proteins generates action potential.
Reason: To maintain the unequal distribution of Na+ and K+, the neurons use electrical energy.
The structural and functional units of the nervous system is ______.
Axons ____________.
What are the gaps between adjacent myelin sheaths called?
What is the connective tissue covering around the nerve fascicle called?
In a neuron, conversion of electrical signal to a chemical signal occurs at/in
What is the correct direction of flow of electrical impulses?
CNS is mostly made of ______
In the following diagram choose the correct labelling for A, B, C, D and E respectively.
Nissl's granules are found in the cytoplasm of ______.
The figure given below is the basic structural and functional unit of the human nervous system. Study the diagram and answer the following questions:
 |
- Write the technical term for the diagram.
- Name two organs of our nervous system where these cells are richly found.
- How are these cells significant for us?
- Name the cell organelle that is absent in these cells and how does it affect our body metabolism?
- Redraw the same figure and label the following Perikaryon, Axon, Dendrites, Myelin sheath and Node of Ranvier.
