Which of the following best represents the distribution of ions in the ECF and ICF of animals? - Ans:✔✔-
Na+ High in the ECF, K+High in the ICF, A- (anions) High in the ICF
According to Fick's equation the diffusion rate of solutes through a cell membrane increases with -
Ans:✔✔-Increased concentration gradient of the solute. Greater Permeability of the membrane for the
solute. High lipid solubility of the solute.
A mammalian cell membrane composed of 75% phospholipids and 25% proteins is likely to: - Ans:✔✔-Be
found in cells that associate themselves with the axons of neurons to "electrically" insulate them from
the ECF
Based on the Nernst equation the equilibrium potentials across the neuron membranes results in values
of +60mv for Na+ AND -90mv for K+. The difference in sign of voltage (positive versus negative) result
from: - Ans:✔✔-The opposite concentration gradient for Na+ and K+ (check this one)
The principle cause of depolarization of a nerve cell is - Ans:✔✔-An increase in membrane permeability
for Na+
Action potential generally originate at a location called axon hillock because - Ans:✔✔-The hillock
contains the highest number of voltage-gated K+ Channels. The hillock has the highest number of
voltage-gated Na+ channels.
The absolute refractory period of a neuron - Ans:✔✔-Is caused by Na+ channels being closed, and no
action potential can occur because these channels are inactivated
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