Which of the following ions present in the nerve cells and surrounding fluid are the most important in conduction of nerve impulse?
Correct answer: A. Na+and K+
- A. Na+and K+
- B. Na+ and Mg++
- C. K+ and Mg++
- D. Mg++ and Ca++
Explanation
Sodium (Na+) and potassium (K+) ions are crucial for the conduction of nerve impulses. During an action potential, there is a rapid influx of Na+ ions into the cell, depolarizing the membrane, followed by an efflux of K+ ions, repolarizing the membrane. This sequential movement of ions along the neuron is essential for propagating the nerve impulse.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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