Hyperpolarization-activated cation current (Ih)- When is this channel activated? What is the directions of flow of current in this channel? Which ions are permeable to in this channel? What is the reversal potential of this channel?

Ca2+ Using Figure 8.1, answer the following questions: 6) What is occurring in Step 2 of the figure above, and how is that process originated? 6) 7) Identify the structures on the postsynaptic membrane that bind with the neurotransmitter 7) in Steps 4 and 6 of the figure above, and indicate their function. 8) In the figure above, the overall function of Steps 6-8, which occur simultaneously, is to 8) 9) Based on the figure, describe the two possible mechanisms whereby Step 5 can occur on the postsynaptic membrane. 9) 10) Based on the figure, identify the structure in Step 6, if this presynaptic neuron is cholinergic. What if the neuron is adrenergic? 10)

Please ASAP. Thank you.

Please ASAP. Thank you.

Please ASAP. Thank you. A hypothetical neuronal cell shows the following intracellular and extracellular concentration of sodium, potassium, calcium, and chloride ions.   Extracellular concentration (mM) Intracellular concentration (mM) (Ion)out/ (Ion)inside E ion at 37 oC Sodium ion 420 60     Potassium ion 25 420     Calcium ion 16 0.4     Chloride 565 45     How does increase in the extracellular potassium concentration to 250 mM affect the Nernst potential? Why?

Please ASAP. Thank you.

Please ASAP. Thank you.