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NEET2009ZoologyLocomotion and MovementActual

Which of the following is important for muscle contraction and nerve impulse transmission?

Options

  1. ACa ²⁺ ions
  2. BMg ²⁺ ions
  3. CBoth (a) and (b)
  4. DFe ²⁺ ions

Correct answer

A. Ca ²⁺ ions

Step-by-step solution

Ca ²⁺ is essential of muscle contraction, neutro-muscular functions and nerve impulse transmission. During nerve impulse transmission, as an impulse arrives at a synaptic knob, calcium ions ( Ca ²⁺ ) diffuse into the knobs from surrounding tissue fluid. Ca ²⁺ trigger a process in which numerous synaptic vesicles fuse with the membrane of the knob and the areas of fusion break down; releasing the contents of vesicles into the fluid of synaptic clefts.

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