QUESTION 8 Which of the following contribute to the negatively-charged resting m

Question

QUESTION 8 Which of the following contribute to the negatively-charged resting membrane potential of an electrically excitable cell? 1.There are more negatively-charged proteins outside the cell than inside, attracting more positive charge to the extracellular environment. 2. The sodium-potassium pump (ATPase) pumps 3 sodium ions out of the cell for every 2 potassium ions it pumps into the cel 3.The membrane is leaky to potassium at rest so some positively-charged potassium ions leave the cell, even at rest. 4. All ion channels in the membrane are closed at rest so no positive charge can get in QUESTION 9 Which of the following ion movements would result in neuron depolarization? 1. Chloride efflux 2Potassium effux 3. Calcium influx 4. Sodium efflux QUESTION 10 Damage to voltage-gated sodium channels in the typical neuron would be expected to result in which of the following? 1. Inability of the pre-synaptic cell to propagate an action potential Inability of the pre-synaptic cell to create an action potential 3Inability of the post-synaptic cell to be able to receive a signal Inability of the pre-synaptic cell to convert an electrical signal to a chemical one

Explanation / Answer

Ans 8 : 2) The sodium potassium pump (ATPase) pumps three sodium ions out of the cell for every 2 potassium ions it pumps into the cell

For a membrane to ne neutral , it must have equal no. of positive and negative entities on either side of the membrane. Due to the sodium potassium pump , the sodium ions accumulate outside the cell and potassium ions inside. The positive charge is more on the outer side , which accounts for the negative potential of the resting membrane .

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