Science (086) — AI-generated practice question

The brain performs complex functions like thinking, memory, and voluntary control, so it needs stronger protection — a rigid bony box (skull) plus a fluid-filled balloon for shock absorption. The fluid cushions the brain against sudden jerks or impacts.

The spinal cord, being a long structure running down the back, requires flexibility for body movement. A rigid box would prevent bending and twisting. Hence, the vertebral column — a series of interlocking bones — protects it while still allowing movement.

A single rigid structure cannot provide both rigid shock absorption and flexible movement simultaneously. Two different mechanisms thus suit the specific structural and functional needs of each part of the CNS.

Source: Chapter 6, Section 6.1.3 – How are these Tissues protected?

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• Examiners expect you to contrast the two mechanisms and link each to its function — don't just describe them separately.
• Key functional words: brain needs shock absorption (fluid-filled balloon) + rigid protection (skull); spinal cord needs flexibility during movement (vertebral column).
• The "why not one uniform structure" part is the core of the question — always address it explicitly in the last point.
• Avoid listing facts without connecting structure → function → advantage.