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PSU Bio 161 Exam 2 CQ/PreWeek/WrapUp (Electrophysiology/ RMP & Graded Potentials)
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PSU Bio 161 Exam 2 CQ/PreWeek/WrapUp (Electrophysiology/ RMP & Graded Potentials)
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PSU Bio 161 Exam 2CQ/PreWeek/WrapUp
(Electrophysiology/ RMP & Graded
Potentials)
T/F?
sodium and potassium ions are both positively charged (cations) - ANSWER✔✔
true
T/F?
ions can cross a membrane without the help of an integral membrane protein -
ANSWER✔✔ false
because ions are charged, they are unable to cross the hydrophobic core of a
membrane. they require integral membrane proteins (either channels or pumps) to
move across a membrane.
T/F?
sodium potassium pumps require the use of energy to move ions - ANSWER✔✔
true
sodium potassium pumps are also classified as enzymes called ATPases because
these proteins hydrolyze ATP (-ase means "to cut") and use the transfer of energy
in active transport
T/F?
sodium potassium pumps move ions down their concentration gradient- from high
concentration to low concentration - ANSWER✔✔ false
sodium potassium pumps work to PUMP or actively move ions. this means that
they are being moved up their gradient fro where they are in low concentration to
high concentration.
T/F?
electrotonic spread requires the use of energy - ANSWER✔✔ false
electrotonic spread (also called a local potential) occurs when a transient high
concentration of sodium ions enter a neuron (usually through a gated channel
during a stimulus.) due to this high concentration, the sodium ions DIFFUSE (from
high to low) and repel each other, leading to a dissipation (or spreading out) of ions
in the neuron
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