InterviewSolution
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The diagram given below is an external view of the human brain. Study the same and answer the questions that follow : (i) Name the parts labelled A, B and C in the diagram. (ii) State the main functions of the parts labelled A and B. (iii) What are the structural and functional units of the brain ? How are the parts of these units arranged in A and B. (iv) Mention the collective term for the membranes covering the bruin. (v) What is the function of Cere-brospinal fluid ? |
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Answer» (i) A-Cerebrum B-Cerebellum C-spinal cord (ii) Cerebrum is the seat of intelligence, consciousness and will power. It controls all voluntary activities. Cerebellum coordinates muscular activities and maintains balance of the body. (iii) Neuron is the structural and functional unit of the brain. In cerebrum, outer portion contains cell bodies of the neuron whereas inner portion contains axons of the neurons. Whereas in spinal cord, outer portion contains axons and inner portion contains cell bodies of neurons. (iv) The membrane covering the brain is meninges which is a 3 membranous covering. (v) Cerebrospinal fluid is a watery fluid found within the space of the covering membrane and also in ventricles of brain and central canal of spinal cord. It acts like a cushion to protect the brain from shocks. It also acts as a medium for the exchange of food materials, waste products and respiratory gases with neurons. |
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