Jan%2021%20questions - Why does an action potential...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Question: Acetylcholine-gated cation channels allow Na + , K + and Ca 2+ to pass through. Why is it mostly Na + that flows in? Answer: K + is near equilibrium, Na + is not. Ca 2+ also flows in but its concentration outside is much less than Na + (1mM vs. 140 mM). Question:
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Why does an action potential propagate (move) in only one direction? Why can’t it propagate backwards? Answer: Na + channels become refractory after opening and cannot respond to another depolarization for a while....
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online