Depolarization is the result of:
Correct answer: B. Influx of Na+
- A. Influx of K+
- B. Influx of Na+
- C. Efflux of K+
- D. Efflux of Na+
Explanation
The influx of Na+ increases the concentration of positively charged ions in the cell and causes depolarization, where the potential of the cell is higher than the cell's testing potential. The sodium channels close at the peak of the action potential, while potassium continues to leave the cell.
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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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