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The organ A which is located inside the skull of our body is protected by a bony box B and it is surrounded by three membranes C. The space between the membranes is filled with a liquid D which protects the organ A from mechanical shocks. The organ A in combination with another organ E makes up to central nervous system.(a)What is organ A?(b)What are (i) B (ii) C, and (iii) D?(c)Name the organ E.(d)While walking barefooted, if we happen to step on a sharp piece of stone, we immediately lift our foot up. Which of the two organs, A or E, is directly involved in this action?(e) If we step out from a darkened room into bright sunshine, we close our eyes for a moment. Which of the two organs, A or E, is directly involved in this action?
(a) The organ A is the brain. The brain is located inside the skull of our body.
(b) (i) B is the cranium. The brain is enclosed by a bony box in the skull called the cranium. (ii) C is the meninges. The brain is surrounded by three layers of membranes called the meninges. (iii) D is the cerebrospinal fluid. It is located between the meninges and protects the brain from mechanical shocks.
(c) The organ E is the spinal cord. The brain (organ A) and the spinal cord (organ E) together make the central nervous system.
(d) The organ E, (spinal cord) is directly involved in this action. The reflexes that involve only the spinal cord are known as spinal reflexes.
(e) The organ A (brain) is directly involved in this action. The reflexes that involve only the brain are known as cerebral reflexes.
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