Answered: Chloride ions (Cl-) behave a bit…

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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Chloride ions (Cl-) behave a bit differently to Na+ and K+ in that most cells don't have active Cl- transporters. As a result, the concentration gradient for Cl- is not 'set' like it is for Na+ and K+. There are, however, a limited number of Cl- leak channels in the cell membrane. As a result, Eci generally matches resting membrane potential - around - 70mV. Considering this, answer the following questions. If Cl- can cross the cell membrane, is not being actively transported, and membrane potential is -70mV, will there be a concentration gradient for Cl-?

Chloride ions (CI) behave a bit differently to
Na+ and K* in that most cells don't have active
Cl transporters. As a result, the concentration
gradient for Cl¯ is not 'set' like it is for Na+ and
K+. There are, however, a limited number of
CI leak channels in the cell membrane. As a
result, Eci generally matches resting membrane
potential - around -70mV. Considering this,
answer the following questions.
If CI can cross the cell membrane, is not being
actively transported, and membrane potential is
-70mV, will there be a concentration gradient
for Cl-?
O No, CI will be in the same concentration in the
ICF and ECF.
Yes, CI will be more concentrated in the ECF.
Yes, CI will be more concentrated in the ICF.

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