Question

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 the central nervous system.

1. What is organ A?
2. What are B, C and D?
3. Name the organ E.
4. 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?
5. 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?

Answer 1

1. Organ A: Brain
2. • B: Cranium. 
   • C: Meninges
   • D: Cerebrospinal
3. Organ E: Spinal cord
4. Organ E (Spinal cord), because it controls the reflex action.
5. Organ A (Brain), because it controls this response.