Exam (elaborations)
BIO 264: Exam 2 review 2024 Updated Exam Questions and Answers
BIO 264: Exam 2 review 2024 Updated Exam Questions and Answers
[Show more]
Content preview
BIO 264: Exam 2 review 2024 UpdatedExam Questions and Answers
Which ion has greatest influence on resting membrane potential? - -
Potassium (potassium has more leak channels on the membrane than
sodium, which is why potassium has a higher permeability value and has
more impact of resting membrane potential)
-Concerning resting membrane potential, the inside of the membrane is
_______ compared to the ________ charged outside. - -negative, positively.
-T or F:
The diffusion of K+ and Na+ down their chemical gradients contributes to
the resting membrane potential - -F
-At resting membrane potential, ______________________. - -extracellular
sodium levels are high
-During the hyper polarization phase... - -K+ leaves the cell
-Which is not a characteristic of a graded potential?
A) Spreads in a decremental fashion
B)Can result from changes in voltage across the membrane
C) Can summate
D) Size is inversely proportional to stimulus strength - -D
-As the stimulus strength and size of the graded potential _____________ the
action potential frequency ___________. - -increases; increases
-The outside of a cell during resting membrane potential is _________ in
relation to the inside of the cell. - -Positively charged
-If at resting membrane potential (RMP), the plasma membrane became
more permeable to K+, the cell would _________________________. - -
hyperpolarize
-Which ion has greatest influence on resting membrane potential? - -K+
-Which statement is true?
A) ATP is required to move Na+ extracellularly
B)Ca+ binding to specific ion channels stops the intracellular diffusion of Na+
C) Na+ relies on a specific type of ion channel for diffusion
D) All are true
E) Two are true
, F) None are true - -D
-If extracellular concentration of K+ increases, what will the effect be on the
resting membrane potential? - -The increase in extracellular K+
concentration will decrease the normal K+ gradient; because of this K+ has
less of a tendency to diffuse out of the cell. The resting membrane potential
becomes less negative (depolarizes).
-If you increased the concentration of extracellular Na+ of a membrane at
resting membrane potential, what would happen? - -hardly any change in
the membrane potential
-If a cell membrane became more permeable to Na+ what would happen to
the resting membrane potential? - -Na+ diffuses into the cell causing
depolarization.
-The flu virus increases cellular membrane permeability to K+. You would
expect the cells of someone suffering from the flu to _______. - -
hyperpolarize
-If a plasma membrane becomes more permeable to K+ the charge
difference across the plasma membrane will _________, or (AKA) _________. - -
increase, hyperpolarize
-If the extra cellular fluid around a muscle cell is replaced with an isotonic
saline solution that contains less K+ than the normal extra cellular fluid, the
result would be: - -a hyperpolarized membrane
-The resting membrane potential of a cell is = -60mV, and the intracellular
and extracellular Cl- concentrations are [Cl-]inside = 7 mM and [Cl-]outside =
105 mM, respectively. Which of the following statements is FALSE?
A) The Cl- electrical gradient is inward
B) The Cl- concentration gradient is inward
C) Both a and b are True statements
D) Both a and b are False statements - -A
-T or F:
Simple diffusion is based on the fact that molecules are in constant, random
motion. Because of collisions with each other, and anything else in the
particles way, they eventually disperse- or are evenly distributed throughout
the system. - -T
-The "All-or-None" principle - -whether the stimulus is just strong enough to
reach threshold or if it is so strong to surpass the threshold, the action
potential will proceed without stopping
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Victorious23. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £6.93. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79223 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now