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WAEC Biology 2014 Question 13

Question 13

Nervous Coordination

The legs of an accident victim with a fractured vertebral column and injured spinal cord could not be raised because

  1. A.impulses from receptors in the legs cannot travel to the brain.
  2. B.impulses from the brain cannot travel to the legs.
  3. C.chemical substances will be released at synapses in the central nervous system.
  4. D.reflex actions cannot take place in the legs.
Show the answer and explanation

Answer: B (impulses from the brain cannot travel to the legs.)

Explanation

To move the legs, impulses must go from the brain down the spinal cord to the leg muscles; a break in the cord stops them, so the legs are paralysed.