Question

6. (2pts) In order to test the hypothesis that the rising phase of the action potential is caused by $Na^+$ influx, researchers recorded the magnitude of the action potential when in a normal solution (like sea water, Figure 1A) and then again after increasing the extracellular $Na^+$ concentration. With the increased extracellular $Na^+$ concentration, do you predict the action potential to look more like the red or blue curve (Figure 1B)? Why?

          6. (2pts) In order to test the hypothesis that the rising phase of the action potential is caused by $Na^+$ influx,
researchers recorded the magnitude of the action potential when in a normal solution (like sea water, Figure 1A)
and then again after increasing the extracellular $Na^+$ concentration. With the increased extracellular $Na^+$ 
concentration, do you predict the action potential to look more like the red or blue curve (Figure 1B)? Why?

6. (2pts) In order to test the hypothesis that the rising phase of the action potential is caused by Na^+ influx,
researchers recorded the magnitude of the action potential when in a normal solution (like sea water, Figure 1A)
and then again after increasing the extracellular Na^+ concentration. With the increased extracellular Na^+
concentration, do you predict the action potential to look more like the red or blue curve (Figure 1B)? Why?

Added by Margaret C.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

Instant Answer

Solved by Expert Supreeta N

03/27/2023

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Step 1: The researchers recorded the magnitude of the action potential in a normal solution, like sea water (Figure 1A). Show more…

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6. (2pts) In order to test the hypothesis that the rising phase of the action potential is caused by Na* influx researchers recorded the magnitude of the action potential when in a normal solution (like sea water, Figure 1A) and then again after increasing the extracellular Na* concentration. With the increased extracellular Na concentration, do you predict the action potential to look more like the red or blue curve (Figure 1B)? Why? +40 sea water +20 membrane potential (mV) -20 -40 -60 -80 1 2 time (ms) Figure 1A +40 sea water +20 membrane potential(mV) -20 -40 60 -80 1 2 time (ms) Figure 1B