QUESTION 16 The Na-K ion exchange pump actively transports 3 intracellular sodium ions for 2 extracellular potassium ions. 3 intracellular sodium ions for 1 extracellular potassium ion. 1 intracellular sodium ion for 2 extracellular potassium ions. 2 intracellular sodium ions for 1 extracellular potassium ion. 3 extracellular sodium ions for 2 intracellular potassium ions. QUESTION 17 The ______ gland sits along the superior border of the kidney. thyroid salivary pituitary parathyroid suprarenal
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Which of the following help to set the resting potential of a neuron? (Select all that apply) The permeability of the membrane to potassium ions. The activity of the sodium/potassium pump. The concentration of potassium ions inside and outside the cell. The concentration of sodium ions inside and outside the cell. The permeability of the membrane to sodium ions.
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Describe any movements of sodium and potassium ions that occur while a neuron is at rest (4 points). Which ion has the greatest permeability? Why? Is there any movement of ions across the plasma membrane? If so, which ion is moving in which direction and how? What is the role of the sodium/potassium pump? 2. Define and describe equilibrium potential and give its value for sodium and potassium. 3. Based on all of this information, which ion has the greatest effect on resting membrane potential?
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Question 11 In the nephron, where does most (65%) sodium ion reabsorption occur? (2 points) a. Proximal convoluted tubule b. Nephron loop c. Distal convoluted tubule d. Collecting duct Question 12 What is the primary mechanism for sodium ion reabsorption in the proximal convoluted tubule? (2 points) a. Primary active transport b. Passive diffusion driven by the electrochemical gradient c. Passive diffusion driven by the bulk water flow d. Movement through transmembrane aquaporins Question 13 Where are nutrients such as glucose and lactate reabsorbed (reclaimed) in the nephron? (2 points) a. Proximal convoluted tubule b. Nephron lood c. Distal convoluted tubule d. Collecting duct Question 14 What is the mechanism of reabsorption (reclaiming) for nutrients such as amino acids and vitamins? (2 points) a. Primary active transport b. Secondary active transport with sodium ions c. Passive diffusion driven by the electrochemical gradient d. Passive diffusion in conjunction with bulk water flow e. Endocytosis
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