PHYSIOLOGY EXAM 2 WITH CORRECT
QUESTIONS AND ANSWERS.
Myelin is formed by - CORRECT ANSWERS.✔️✔S️ chwann cells and oligodendrocytes
What would the sudden increase in axonal permeability to sodium cause? - CORRECT
ANSWERS.✔️✔️The rising phase of an action potential
Which of the following statements best describes the concept of permeability? Choose the best answer.
- CORRECT ANSWERS.✔️✔️the ability of a molecule to cross the cell membrane
The two cells below are hypothetical cells with a concentration of 100 mOsm of K+ inside the cells and
containing only leak channels for K+ within the membrane. Each cell is places into a different solution
containing different concentrations of K+ in the extracellular fluid. Which of the two cells below has a
higher permeability to K+ and why?
A= 3 leak channels
in 300 mosmol K+ solution
B= 5 leak channels
in 50 mosmol K+ solution - CORRECT ANSWERS.✔️✔️B, because it has more ion leak channels for K+
than A.
Which of the following statements best describes the resting membrane potential? Choose the best
answer. - CORRECT ANSWERS.✔️✔️an electrical gradient that exists between the intracellular and
extracellular fluids
__________ ions are more concentrated on the outside of the cell, this would result in diffusion of the
ion into the cell - CORRECT ANSWERS.✔️✔️Sodium (Na+)
___________ ions are more concentrated on the inside of the cell, this would result in diffusion of the
ion out of the cell. - CORRECT ANSWERS.✔️✔️Potassium (K+)
, Identify whether each of the following would result in the membrane potential becoming more positive
or more negative.
Increasing the concentration of Na+ in the extracellular fluid
Increasing the concentration of K+ in the extracellular fluid - CORRECT ANSWERS.✔️✔️more positive
Identify whether each of the following would result in the membrane potential becoming more positive
or more negative.
Inserting more K+ leak channels into the cellular membrane
Decreasing the number of leak channels for Na+ along the cellular membrane
Decreasing the concentration of K+ in the extracellular fluid - CORRECT ANSWERS.✔️✔️more negative
In a graded potential, what is the effect of cytoplasmic resistance and current leak? - CORRECT
ANSWERS.✔️✔️The strength of the signal inside the cell decreases over a distance.
Action potentials are primarily associated with the membranes of - CORRECT ANSWERS.✔️✔a️ xons
only.
The part of the neuron that receives most of the incoming signals is the _______. - CORRECT
ANSWERS.✔️✔️dendrite
Which characteristics of channels is determined by the gating state of the channel? - CORRECT
ANSWERS.✔️✔️conductance
The region where the axon terminal meets its target cell is called the - CORRECT
ANSWERS.✔️✔️synapse
QUESTIONS AND ANSWERS.
Myelin is formed by - CORRECT ANSWERS.✔️✔S️ chwann cells and oligodendrocytes
What would the sudden increase in axonal permeability to sodium cause? - CORRECT
ANSWERS.✔️✔️The rising phase of an action potential
Which of the following statements best describes the concept of permeability? Choose the best answer.
- CORRECT ANSWERS.✔️✔️the ability of a molecule to cross the cell membrane
The two cells below are hypothetical cells with a concentration of 100 mOsm of K+ inside the cells and
containing only leak channels for K+ within the membrane. Each cell is places into a different solution
containing different concentrations of K+ in the extracellular fluid. Which of the two cells below has a
higher permeability to K+ and why?
A= 3 leak channels
in 300 mosmol K+ solution
B= 5 leak channels
in 50 mosmol K+ solution - CORRECT ANSWERS.✔️✔️B, because it has more ion leak channels for K+
than A.
Which of the following statements best describes the resting membrane potential? Choose the best
answer. - CORRECT ANSWERS.✔️✔️an electrical gradient that exists between the intracellular and
extracellular fluids
__________ ions are more concentrated on the outside of the cell, this would result in diffusion of the
ion into the cell - CORRECT ANSWERS.✔️✔️Sodium (Na+)
___________ ions are more concentrated on the inside of the cell, this would result in diffusion of the
ion out of the cell. - CORRECT ANSWERS.✔️✔️Potassium (K+)
, Identify whether each of the following would result in the membrane potential becoming more positive
or more negative.
Increasing the concentration of Na+ in the extracellular fluid
Increasing the concentration of K+ in the extracellular fluid - CORRECT ANSWERS.✔️✔️more positive
Identify whether each of the following would result in the membrane potential becoming more positive
or more negative.
Inserting more K+ leak channels into the cellular membrane
Decreasing the number of leak channels for Na+ along the cellular membrane
Decreasing the concentration of K+ in the extracellular fluid - CORRECT ANSWERS.✔️✔️more negative
In a graded potential, what is the effect of cytoplasmic resistance and current leak? - CORRECT
ANSWERS.✔️✔️The strength of the signal inside the cell decreases over a distance.
Action potentials are primarily associated with the membranes of - CORRECT ANSWERS.✔️✔a️ xons
only.
The part of the neuron that receives most of the incoming signals is the _______. - CORRECT
ANSWERS.✔️✔️dendrite
Which characteristics of channels is determined by the gating state of the channel? - CORRECT
ANSWERS.✔️✔️conductance
The region where the axon terminal meets its target cell is called the - CORRECT
ANSWERS.✔️✔️synapse
