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Interpreting an Action Potential Tracing.

You are watching: What does 0 mv on the y-axis of an action potential tracing represent?

Using the tracing over, drag each of the terms or values on the left to correctly complete the sentences on the best.


1. This neuron is most depolarized at (+30) mV. 2. This neuron spends approximately (2.5) msec in a hyperpolarized state. 3. The ion (K+) is crossing the cell"s plasma membrane at 1.5 msec. 4. This cell reaches thresorganize at about (0.6) msec.

Comparing and also contrasting the 2 kinds of voltage-gated ion channels


Similarities:

- The stimulus that triggers opening

- The polarity of the substances they deliver across the membrane

- The placement of channel protein loved one to the membrane


Understanding the sequence of activity potential events

An essential aspect of finding out physiology is knowledge the cause-and-impact relationships in pathmethods. This activity will test your expertise of the sequence of occasions in an action potential. Place the action potential events listed below in the correct sequence. If two occasions occur all at once, area one on optimal of the various other.


1. Activation gates on NA+ networks open; Na+ enters cell.

2. Cell Depolarizes.

3. Inactivation gates on Na+ channels close & Activation gateways on K+ channels open; K+ leaves cell

4. Cell Repolarizes.

5. Activation entrances on K+ networks begin to close

6. Cell experiences hyperpolarization.


Matching ion channel says via the phases of the action potential

Match each phase of an activity potential with the claims of the ion channels you have studied. Drag the labels onto the table to suggest whether the channel is open, closed, or intriggered at the given phase of an action potential. You may usage a label as soon as or more than as soon as.


Resting State: Na+ networks closed, K+ networks closed

Depolarization: Na+ open, K+ closed

Repolarization: Na+ intriggered, K+ open

Hyperpolarization: Na+ closed, K+ open


Understanding why hyperpolarization happens

Following repolarization, the neuron might come to be slightly hyperpolarized prior to it re-develops its relaxing membrane potential.

Hyperpolarization is due to a difference in between just how the voltage-gated Na+ and also K+ channels job-related. What is this difference?


Voltage-gated Na+ channels sheight the flow of Na+ relatively quickly, while voltage-gated K+ channels are slow-moving to close, leading to the overshoot.

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Making predictions based upon your understanding

Interpreting tracings of membrane potential is a vital skill in a course choose this. In future chapters, you will see other instances of cells experiencing changes in membrane potential. For instance, the tracing below is from a cardiac muscle fiber that is undergoing an action potential.

Based on your understanding of activity potentials in neurons, what deserve to you conclude around exactly how they occur in cardiac muscle fibers?