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What type of ion current could have produced the membrane potential in E? -40 -50 - -60- D E F -70- A B C -80 - -90 Time sodium ion (Na*) potassium ion (K* ) calcium ion (Ca2+) Membrane potential (mV)

What type of ion current could have produced the membrane potential in E? -40 -50 - -60- D E F -70- A B C -80 - -90 Time sodium ion (Na*) potassium ion (K* ) calcium ion (Ca2+) Membrane potential (mV)

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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### Question 13 What type of ion current could have produced the membrane potential in E? #### Graph Description: The graph displayed illustrates the changes in membrane potential (measured in millivolts, mV) over time. The membrane potential is plotted on the y-axis, ranging from -90 mV to -40 mV, with a resting membrane potential at approximately -70 mV. The x-axis represents time. There are several distinct phases labeled A, B, C, D, E, and F on the graph: - **Region A:** Shows a slight increase in membrane potential. - **Region B:** Membrane potential elevates slightly more. - **Region C:** Exhibits moderate elevation in membrane potential. - **Region D:** A peak in membrane potential, reaching near -50 mV. - **Region E:** Demonstrates a sharp drop in membrane potential to around -80 mV. - **Region F:** Indicates another pronounced drop in membrane potential. The yellow line traces the membrane potential changes across these regions. #### Answer Choices: - ⬤ Sodium ion (Na⁺) - ⬤ Potassium ion (K⁺) - ⬤ Calcium ion (Ca²⁺) --- In answering the question, consider how each type of ionic movement affects the membrane potential. For instance: - **Sodium ions (Na⁺):** Influx typically depolarizes the cell, increasing the membrane potential. - **Potassium ions (K⁺):** Efflux typically hyperpolarizes the cell, decreasing the membrane potential. - **Calcium ions (Ca²⁺):** Influx also tends to depolarize the cell, similar to sodium but with varying influence due to charge and cellular mechanisms. Based on the sharp drop in membrane potential observed in region E, potassium ion (K⁺) efflux could be a likely cause, as it often leads to hyperpolarization of the membrane. #### Selection: ⬤ Potassium ion (K⁺)
Transcribed Image Text:### Question 13 What type of ion current could have produced the membrane potential in E? #### Graph Description: The graph displayed illustrates the changes in membrane potential (measured in millivolts, mV) over time. The membrane potential is plotted on the y-axis, ranging from -90 mV to -40 mV, with a resting membrane potential at approximately -70 mV. The x-axis represents time. There are several distinct phases labeled A, B, C, D, E, and F on the graph: - **Region A:** Shows a slight increase in membrane potential. - **Region B:** Membrane potential elevates slightly more. - **Region C:** Exhibits moderate elevation in membrane potential. - **Region D:** A peak in membrane potential, reaching near -50 mV. - **Region E:** Demonstrates a sharp drop in membrane potential to around -80 mV. - **Region F:** Indicates another pronounced drop in membrane potential. The yellow line traces the membrane potential changes across these regions. #### Answer Choices: - ⬤ Sodium ion (Na⁺) - ⬤ Potassium ion (K⁺) - ⬤ Calcium ion (Ca²⁺) --- In answering the question, consider how each type of ionic movement affects the membrane potential. For instance: - **Sodium ions (Na⁺):** Influx typically depolarizes the cell, increasing the membrane potential. - **Potassium ions (K⁺):** Efflux typically hyperpolarizes the cell, decreasing the membrane potential. - **Calcium ions (Ca²⁺):** Influx also tends to depolarize the cell, similar to sodium but with varying influence due to charge and cellular mechanisms. Based on the sharp drop in membrane potential observed in region E, potassium ion (K⁺) efflux could be a likely cause, as it often leads to hyperpolarization of the membrane. #### Selection: ⬤ Potassium ion (K⁺)
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