Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question
Please help me with these additional action potential questions.

Transcribed Image Text:4. Why is sodium conductance rise in a pulse, but potassium conductance rise and stay high until
the applied voltage is stopped.
As a reminder, this image to the right is what a
normal action potential in a neuron would look
like. The dashed line horizontal across the
graph labels threshold potential.
Tetrodotoxin (TTX) is a neurotoxin that is found
as a defense in a diverse assortment of animals
such as pufferfish, rough-skinned newts, and
blue-ringed octopuses. When TTX is applied to
a neuron, which is then excited to threshold, the
plot of the resulting membrane potential of the
neuron looks like the figure to the right.
5. Based on what you know of action
potentials, hypothesize specifically what
TTX did to this cell to cause this reaction.
40
Membrane Potential (mV)
-80
0
-40
40
Membrane Potential (mV)
-80
0
-40
Time
Time
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