বহুনির্বাচনি (MCQ)
১. The resting membrane potential of a nerve fibre is mainly due to:
ক) Active pumping by Na+/K+ ATPase
খ) Diffusion of K+ out of the cell through leak channels
গ) Diffusion of Na+ into the cell
ঘ) Movement of Cl- into the cell
ঙ) Ca2+ influx
উত্তর দেখুন
সঠিক উত্তর: খ) Diffusion of K+ out of the cell through leak channels
ব্যাখ্যা: At rest the membrane is far more permeable to K+, so K+ diffusion makes the largest contribution (about −90 mV potential for K+). The Na+/K+ pump adds only a few millivolts directly, but keeps the gradients.
📖 রেফারেন্স: Guyton & Hall, Textbook of Medical Physiology · Membrane potentials and action potentials
