Q2 Flashcards
The resting membrane potential of a cell is -70 mV. What will happen to the Vm, if X+1 channels open, and X+1 moves across the plasma membrane down its electrochemical gradient ([X+1]ECF = 1 mM; [X+1]ICF = 25 mM).
hyperpolarize
The resting membrane potential of a cell is -70mV. What will happen to the Vm, if Z- channels open, and Z- moves across the membrane down its electrochemical gradient ([Z-]ECF = 3 mM; [Z-]ICF = 1 mM)?
depolarize
Compared to the cytosol of the cell, what is the osmolarity of the bathing solution?
Hyperosmotic
Compared to the cytosol of the cell, what is the tonicity of the bathing solution?
Hypotonic
_If the rectangles represent glucose, which of the following would increase its diffusion rate?
Increasing the number of glucose carriers in the membrane
Which of the following substances could the squares represent?
CO2
Amino Acid
Ethanol
All of the above
a and c only
Amino Acid
A RBC has 300mOsm of nonpenetrating solute in its cytosol and sits in a bathing solution composed of 100 mM NaCl, 100 mM KCl, and 100mM Dextrose.What is the tonicity of the bathing solution?
hypertonic
A RBC has 300mOsm of nonpenetrating solute in its cytosol and sits in a bathing solution composed of 100 mM NaCl, 100 mM KCl, and 100mM DextroseWhat is the osmolarity of the bathing solution?
Hyperosmotic
A RBC has 300mOsm of nonpenetrating solute in its cytosol and sits in a bathing solution composed of 100 mM NaCl, 100 mM KCl, and 100mM Dextrose. How will cell volume change?
Decrease
Looking at the transport processed below (choices A - H), which ones would be considered secondary active. Assume Na+ and K+ are distributed as normally found in the body and all other ions are distributed as defined.
C and E only
A 1
B 1
C 2
D facilliated
E 2
In looking at the graph below, which number corresponds to the period of time when both the inactivation and activation gates of the voltage gated Na+ channels are open?
1
What are chacteristics of a graded potential?
-travels over short distances
-lose strength as travel
-can be depolarizations or hyperpolarizations
-varibale strength
Which of the following substances could the rectangles represent?
-Glucose
-O2
-Na+
-All of the above
-a and c only
A and C only
In which direction will there be net H2O movement via osmosis?
out of the cell
Which of the following substances is found at higher levels in the ICF?
Na+
Mg++
Ca++
All of the above
a and c only
Mg++
What type of transport process is occurring at C?
Interstitial Fluid
Cytosol Lumen
[Glucose]Low [Glucose]High
Facilitated Diffusion via carrier
What type of transport process is occurring at F?
Lumen
[Na+]High
Secondary active antiporter
what way will dots move via diffusion?
into the cell
what way will triangles move via diffusion?
no net movement
what type of substance could the triangle represent?
hydrophilic
if start represent hydrophobic substance would increase the diffusion of stars
anything that increases the concentration gradient
increase concentration, temp, surface area
decrease distance or resistance
In which direction will there be net movement of squares via diffusion?
into the cell
