BIOL 325 Physiology Name: Section: Homework #6. Electrical Impulses Instructions

Question

BIOL 325 Physiology Name: Section: Homework #6. Electrical Impulses Instructions. You may print out the homework and write in the answers 1. (7 pts) Ion channels are involved with generating action potentials. To the nght is an electrical profile of a neuronal action potential. In the boxes below list whether the channels are all open, all closed, opening or closing at each of the letters shown in the profile? (Opening implies that channels were 'all closed and are moving toward their 'all open' state Closing indicates the opposite. Use the term closing' to represent the inactivation of the Na channels.) Channel Type Leak K' channels Voltage-gated Na channels Voltage-gated K channels

Explanation / Answer

Leak K+ channel: Open, open, open, open, open (Leak channel is always open)

Voltage gated Na+ channel: Close, open, close, close, close (Voltage gated channel closed at the resting membrane potential, open when an action potential generate and close when action potential reaches to its maximum value (almost -40mV)

Voltage gated K+ channel: Close, open, open, open, open (voltage gated potassium channel closed at resting membrane potential and open when action potential generate keep open even beyond the resting membrane potential (hyperpolarization) .

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