Explain how ion channels alter the electrical properties of a nerve cell membrane
What will be an ideal response?
Answer: Ions are charged particles that are unequally distributed across the cell membrane. When ion channels open, diffusion and electrostatic pressure push sodium ions into the cell or potassium ions out of the cell. These movements result in changes in voltage across the membrane.
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Which of the following is not one of the six “core virtues” espoused by worldwide religious and philosophical teachings?
A. Courage B. Humility C. Wisdom D. Justice
Beth has noticed that her nine-year-old son, Billy, has trouble going to sleep at night and frequently tosses and turns for hours after she puts him to bed. Billy and Beth could most benefit from a suggestion that they
a. use mental imagery by picturing relaxing scenes, such as lying on a warm tropical beach, as he gets ready for sleep b. limit his intake of caffeine in the afternoons by not drinking coffee after 4 p.m. each day c. try to "force" sleep by insisting that Billy remain as still and motionless in bed as possible d. adopt a regular exercise program and encourage Billy to exercise vigorously shortly before bedtime e. establish a regular bedtime routine and consistently go through this routine before sending Billy to bed