Biology
The figure given below is the basic structural and functional unit of the human nervous system. Study the diagram and answer the following questions:
(a) Write the technical term for the diagram.
(b) Name two organs of our nervous system where these cells are richly found.
(c) How are these cells significant for us ?
(d) Name the cell organelle that is absent in these cells and how does it affect our body metabolism ?
(e) Redraw the same figure and label the following — Perikaryon, Axon, Dendrites, Myelin sheath and Node of Ranvier.
Nervous System
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Answer
(a) Neuron
(b) Brain and spinal cord
(c) Neurons are the fundamental building blocks of the nervous system. They help us to process information, control our movements, allow us to perceive the world around us, and are involved in learning and memory.
(d) Centrosome is the cell organelle absent in these cells. It is absent because the nerve cells have lost the ability to divide.
(e) Below is the labelled diagram of neuron:
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(c) Name the basic unit of the brain.
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The diagram given below shows the internal structure of spinal cord depicting a phenomenon. Study the diagram and answer the following questions.
(a) Name the phenomenon shown in the figure and define the same.
(b) Identify the parts labelled as 1 and 2. Write one functional difference between these two.
(c) Name the bony protective covering and the membranous protective covering of the spinal cord.
(d) Label the guidelines 3 and 4.
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(f) Give the technical term for the point of contact between the two nerve cells.
(g) Name the fluid filled inside the central canal of spinal cord.
(h) Name the term used for a small gap between two neurons.
(i) Give one example of a neurotransmitter.
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Given below is the partially incomplete scheme of the components of peripheral nervous system. Fill up the blanks numbered (1) - (12).
