1. Repeat question 1 for the case in which V m = – 100 mV. 2. Design an epithelium that moves…

1. Repeat question 1 for the case in which Vm = -100
mV.

2. Design an epithelium that moves potassium from
the lumen to the interstitial fluid with a minimum number of proteins.Include
all proteins required to accomplishthe
task.

3. Ion channels can be regulated to open or close,
changing the permeability of the membrane to a specific ion. Assume that a cell
at a membrane potential of – 70 mV
has few open sodium channels. Knowing that the equilibrium potential for sodium
is + 60 mV, predict what would happen to the membrane
potential if many sodium channels suddenly went from a closed

1. Repeat question 1 for the case in which Vm = -100
mV.

2. Design an epithelium that moves potassium from
the lumen to the interstitial fluid with a minimum number of proteins.Include
all proteins required to accomplishthe
task.

3. Ion channels can be regulated to open or close,
changing the permeability of the membrane to a specific ion. Assume that a cell
at a membrane potential of – 70 mV
has few open sodium channels. Knowing that the equilibrium potential for sodium
is + 60 mV, predict what would happen to the membrane
potential if many sodium channels suddenly went from a closed state to an open
state. Explain your answer.

Q64;

1. Oubain is a drug that blocks the Na+K+ pump.
Describe and explain the effects you would
expect oubain to have on (1) sodium concentration gradients across cell
membranes, (2) potassium concentration gradients across cell membranes, and (3)
movement of molecules by secondary active transport coupled with sodium.

2. Arachidonic acid is the raw material for the synthesis of

a) Amines.

b) Thyroid hormones.

c) Eicosanoids.

d) Steroids.

e) Peptides.

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