Biology
The diagram alongside shows a section of the human brain and its associated parts. Answer the questions that follow:
(a) Name the parts labelled 1, 2, 3 and 4.
(b) Name the protective membranous covering of the brain. Also mention its three layers.
(c) Name the basic unit of the brain.
(d) Write the important role of the part mentioned as 2.
Nervous System
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Answer
(a) The parts labelled 1-4 are:
- 1 → Cerebrum
- 2 → Cerebellum
- 3 → Pons
- 4 → Medulla oblongata
(b) The brain is protected by 3 membranous coverings called Meninges. The three layers of meninges are:
- Dura mater
- Arachnoid
- Pia mater.
(c) Neuron/nerve cell.
(d) Cerebellum (part 2) is concerned with maintaining the balance of the body and the coordination of muscular activities.
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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.