What happens when a person dies, cellular respiration stops, ATP production stops, and thus, the Na+/K+ pump stops working? Explain your answer.

BIOL2401Bonus Assignment: Neuron Action Potential (5 pts)

 Use another color for your answers*

 The process of an action potential propagation along a neuron’s axon was discussed in lecture this week.  The diagram below illustrates each step of the process from A to F.

A      B    C

D        E     F

Describe the image:

What is happening at each step of the image.  Be sure to note what is happening at each neuron membrane potential, which ion channels are open/closed, and the direction of ion movement.

(-70 mV)

(-60 mV)

(+10 mV)

(+30 mV)

(-90 mV)

(-70 mV)

Label the neuron action potential graph below with corresponding A-F.

Explain the plausible meanings and/or purposes: From image A above, knowing the criteria of a resting membrane potential, what are the purple (+) charged balls?  What are the orange (+) charged balls?  What is the significance of their movement in/out of the neuron membrane?  In addition, what do the purple doors and orange doors represent?  Are they chemically-gated or voltage gated?  How can you tell?

Discuss the potential consequences and/or implications of the image’s meaning:From what you have discussed in the descriptions above, why is the presence of a Na+/K+ pump critical for a neuron?  What happens when a person dies, cellular respiration stops, ATP production stops, and thus, the Na+/K+ pump stops working?  Explain your answer.

What happens when a person dies, cellular respiration stops, ATP production stops, and thus, the Na+/K+ pump stops working? Explain your answer.