User:Walter027

DIRECTIONS: Each question below contains several suggested responses. Select the one best response to each question.

                                            --Walter027 (discuss • contribs) 22:12, 14 April 2015 (UTC)physiology qns'--Walter027 (discuss • contribs) 22:12, 14 April 2015 (UTC)

1. Which of the following characteristics of an axon is most dependent on its diameter? a. The magnitude of its resting potential b. The duration of its refractory period c. The conduction velocity of its action potential d. The overshoot of its action potential e. The activity of its sodium-potassium pump 2. A red blood cell will swell the most when it is placed in a solution containing a. 100 mmol calcium chloride b. 150 mmol sodium chloride c. 200 mmol potassium chloride d. 250 mmol urea e. 300 mmol mannitol 3. If the extracellular K+ concentration is increased from 4 meq/L to 10 meq/L, a. The membrane potential will become more negative b. The sodium conductance will increase c. The potassium conductance will increase d. The membrane will become more excitable e. The Na-K pump will become inactivated 4. Inactivation of the sodium-potassium pump will cause a. An increase in the intracellular volume b. An increase in the intracellular potassium concentration c. Hyperpolarization of the membrane potential d. An increase in the excitability of nerve cells e. An increase in the flow of sodium out of the cell