PNB 2264 EXAM 2 PRACTICE QUESTIONS AND
CORRECT ANSWERS
◉ carriers, ion channels.
Answer: what permits movement of ions across the membrane
◉ excitable cells.
Answer: cells that can change or respond to environment
◉ skeletal muscles, neurons.
Answer: examples of excitable cells (2)
◉ electrical signals, ions.
Answer: Luigi Galvani stated that cells in body could respond to ___,
which comes from ____
◉ overcoming electrical energy.
Answer: how are charges separated
◉ change in concentration gradient.
Answer: what allows moments of ions across the membrane
,◉ membrane potential.
Answer: uneven distribution of electrical charge across the
membrane
◉ membrane potential.
Answer: the moment of ions creates changes in
◉ send/receive signals inside cells.
Answer: the electrical potential energy stored in the membrane is
used to
◉ voltage.
Answer: membrane potential is expressed as a
◉ potential inside cell relative to outside cell, always negative (total
amount of cell).
Answer: how is membrane potential recorded
◉ Vm = 0.
Answer: what if you put both electrodes inside of the cell
,◉ signal would be opposite.
Answer: what if you switch recording and reference
◉ passive.
Answer: ion channels are active/passive
◉ stores energy, prevents ions from moving from high to low
concentration, different voltages.
Answer: how is membrane like a battery
◉ no.
Answer: are ions distributed equally across cell membrane
◉ -70 mV.
Answer: average resting potential
◉ inside.
Answer: is K higher inside or outside cell
◉ outside.
Answer: is Na higher inside or outside cell
, ◉ outside.
Answer: is Cl higher inside or outside the cell
◉ unequally.
Answer: membranes are _____ permeable to various ions
◉ less.
Answer: membranes are more/less permeable to Na than K at rest
◉ high to low.
Answer: ion channels are always ____ concentration to ____
concentration
◉ no movement.
Answer: concentration gradient, no permeability
◉ all ions move from high to low concentration until there's no
concentration gradient left, no electrical potential.
Answer: concentration gradient, non selective permeability
◉ + moves from high to low concentration, then some moves back
because of negative charge inside relative to outside (electric
potential).
CORRECT ANSWERS
◉ carriers, ion channels.
Answer: what permits movement of ions across the membrane
◉ excitable cells.
Answer: cells that can change or respond to environment
◉ skeletal muscles, neurons.
Answer: examples of excitable cells (2)
◉ electrical signals, ions.
Answer: Luigi Galvani stated that cells in body could respond to ___,
which comes from ____
◉ overcoming electrical energy.
Answer: how are charges separated
◉ change in concentration gradient.
Answer: what allows moments of ions across the membrane
,◉ membrane potential.
Answer: uneven distribution of electrical charge across the
membrane
◉ membrane potential.
Answer: the moment of ions creates changes in
◉ send/receive signals inside cells.
Answer: the electrical potential energy stored in the membrane is
used to
◉ voltage.
Answer: membrane potential is expressed as a
◉ potential inside cell relative to outside cell, always negative (total
amount of cell).
Answer: how is membrane potential recorded
◉ Vm = 0.
Answer: what if you put both electrodes inside of the cell
,◉ signal would be opposite.
Answer: what if you switch recording and reference
◉ passive.
Answer: ion channels are active/passive
◉ stores energy, prevents ions from moving from high to low
concentration, different voltages.
Answer: how is membrane like a battery
◉ no.
Answer: are ions distributed equally across cell membrane
◉ -70 mV.
Answer: average resting potential
◉ inside.
Answer: is K higher inside or outside cell
◉ outside.
Answer: is Na higher inside or outside cell
, ◉ outside.
Answer: is Cl higher inside or outside the cell
◉ unequally.
Answer: membranes are _____ permeable to various ions
◉ less.
Answer: membranes are more/less permeable to Na than K at rest
◉ high to low.
Answer: ion channels are always ____ concentration to ____
concentration
◉ no movement.
Answer: concentration gradient, no permeability
◉ all ions move from high to low concentration until there's no
concentration gradient left, no electrical potential.
Answer: concentration gradient, non selective permeability
◉ + moves from high to low concentration, then some moves back
because of negative charge inside relative to outside (electric
potential).
