A hypothetical Anion has a Nernst potential of -30 mv. At 0 mv, the Anion flows in which direction? Into the cell Out of the Cell It does not flow
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- What property is responsible for the initial ramp of the membrane potential at the onset of the current pulse?A: Membrane capacitanceB: Membrane resistance explain your choiceAt the membrane of an axón, the action potential is -60 mV for K+ ions. Calculate de external and internal concentration radios.At the Nernst potential for Ca+, the current is 0. That must mean what? The potential difference across the membrane is 0 The electrical and chemical gradients are balanced Ca+ channels are closed None of the above
- The membrane potential for an excitable cell membrane is -70 mV, for sodium ions the Nernst equilibrium potential is +50 mV, the conductivity of the single sodium channel is 10 pS. What is the electrochemical potential difference that is the driving force for sodium ions to migrate? How much current flows through an open sodium channel under these conditions?Explain why a K+ channel does not allow Na+ or Ca2+ ions to pass through it – Na is the smallestwhile Ca is the largest.Compare the sodium current and potassium current when membrane potential is below the reversal potential, at the reversal potential and above the reversal potential of ACh current.
- A hypothetical cation has a Nernst potential of -30 mV. At 0 mV, the cation flows in which direction? Into the cell Out of the Cell It does not flowPlease ASAP. Thanku. Question 24 At the equilibrium potential for Na+, which of the following is true? Na+ channels are closed There is no net movement of Na+ Na+ current is inward K+ current is inwardA local anesthetic (Na+ channel blocker) should do which of the following Make the resting membrane potential more negative Decrease the after hyperpolarization Block the rising phase of the AP None of these
- The differences in relative concentrations of ions inside and outside the cell act as an electrical force. The specific ion(s) MOST important to establishing the resting potential in neurons would be Multiple Choice a) Na+. b) K+. c) intracellular anions (e.g., proteins). d) H+. e) Na+, K+, and intracellular anions are all important.The cleft is a flat disk between the two membranes, radius L= 250 nm and thickness d=20 nm. The neurotransmitter reached the receptor (AChR) within 0.2microseconds. Find the diffusion coefficient D and calculate the mean time at which A reaches AChE (mind the dimensionality). Present D in cm2/s.Explain the time course of the opening and closing of v-g Na+ and K+ channels during the action potential. How does that affect the ionic currents? COMMENTS : answer this question to best of your knowledge to understand the concept well
