Question

use the following information to answer question 13. random order of events prior to nerve impulse conduction 1. sodium ions diffuse inward. 2. ion channels close, and the membrane becomes less permeable to sodium and potassium. 3. a threshold stimulus is received. 4. potassium ions diffuse outward. 5. sodium channels in the membrane open. 6. potassium channels in the membrane open. 13. which sequence places the events leading to the conduction of a nerve impulse in the proper order? a. 1, 5, 4, 6, 2, and 3 b. 2, 3, 1, 5, 4, and 6 c. 3, 6, 4, 5, 1, and 2 d. 3, 5, 1, 6, 4, and 2 hint: logically, you have to pick 1, 2, or 3 as the start. you may forget the detail about what potassium ions do, but this question becomes easy when you focus in on what happens after a threshold stimulus initiates an impulse.

Explanation:

Nerve impulse conduction starts when a threshold stimulus is received (3). Then sodium - channels open (5), sodium ions diffuse inward (1). After that, potassium - channels open (6), potassium ions diffuse outward (4). Finally, ion channels close and the membrane becomes less permeable to sodium and potassium (2).

Answer:

D. 3, 5, 1, 6, 4, and 2