ap chpt 11 questions with 100% correct answers 2023

ap chpt 11know fig 11.1 - correct answer 11.3 - correct answer 11.5 - correct answer The resting membrane potential is maintained by Na+-K+ pumps that actively transport ? into and ? out of the cell. The membrane is more permeable to ?. The concentration of ? is higher outside than inside the cell. The concentration of ? is higher inside than outside the cell. - correct answer 1. k+, na+ 2. k+ 3. Na+ 4. k+ Ions are unequally distributed across the plasma membrane of all cells. This ion distribution creates an electrical potential difference across the membrane. What is the name given to this potential difference? Hints Threshold potential Positive membrane potential Resting membrane potential (RMP) Action potential - correct answer resting membrane potential Sodium and potassium ions can diffuse across the plasma membranes of all cells because of the presence of what type of channel? Hints Ligand-gated channels Voltage-gated channels Sodium-potassium ATPases Leak channels - correct answer leak channels On average, the resting membrane potential is -70 mV. What does the sign and magnitude of this value tell you? Hints The inside surface of the plasma membrane is much more negatively charged than the outside surface. The outside surface of the plasma membrane is much more negatively charged than the inside surface. There is no electrical potential difference between the inside and the outside surfaces of the plasma membrane. The inside surface of the plasma membrane is much more positively charged than the outside surface. - correct answer The inside surface of the plasma membrane is much more negatively charged than the outside surface. The plasma membrane is much more permeable to K+ than to Na+. Why? Hints There are many more voltage-gated K+ channels than voltage-gated Na+ channels. There are many more K+ leak channels than Na+ leak channels in the plasma membrane. The Na+-K+ pumps transport more K+ into cells than Na+ out of cells. Ligand-gated cation channels favor a greater influx of Na+ than K+. - correct answer There are many more K+ leak channels than Na+ leak channels in the plasma membrane. The resting membrane potential depends on two factors that influence the magnitude and direction of Na+ and K+ diffusion across the plasma membrane. Identify these two factors. Hints