lOMoARcPSD|6803794
FORM D
Name: ________________ Student Number: _____________
Question(s) needing attention: ________________
UNIVERSITY OF TORONTO
Faculty of Arts and Science
Department of Physiology
2023 Summer PSL300H1-S-LEC5101 – Term Test 1
Duration: 50 minutes (25 questions total; 1 mark each)
*No aids allowed.
DO NOT BEGIN UNTIL INSTRUCTED TO DO SO
INSTRUCTIONS
1. To ‘bubble in’ numbers and letters, it is best to use an HB pencil, in case you make an error.
Ballpoint pen cannot be erased. Do not make any stray marks on your scantron outside of
boxes. Make sure you fill in the ENTIRE CIRCLE.
2. Fill in all of the information in the box on the left-hand side of the form. Print clearly. In the
“FORM CODE” box on the scantron, indicate which “FORM” (A, B, C or D) is indicated on
the top of the first page of your test.
3. On the right-hand side of the form fill in your STUDENT NUMBER (the blocks first, then
code below). For a 9-digit student number, insert a ZERO in the FIRST box. Be very
careful to code your student number correctly.
4. On the BACK print in your LAST NAME and GIVEN NAME (print in block letters). Sign
the form beside “SIGNATURE”.
5. Complete your answer card BEFORE the end of the exam, as you go along. No extra time is
given at the end to transfer answers to the scantron.
6. BOTH SCANTRON AND TEST BOOKLET MUST BE HANDED IN AT END OF THE EXAM.
Invigilators are not permitted to interpret questions to individual students. If you think that a
question is ambiguous, answer it as you understand it, then make a note at the top of this page (not
your answer card). If you do this, print and sign your name on your question book. Select the
MOST correct or MOST incorrect answer. Note spelling or typing errors do not make a
statement incorrect.
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, lOMoARcPSD|6803794
FORM D
1. Identify the correct statement regarding the movement of substances in facilitated diffusion?
A. Movement of substance is against its concentration gradient
B. Movement of substance is up its concentration gradient
C. Movement of substance is down its concentration gradient
D. Movement of substance is independent of its concentration gradient
2. During an action potential, a strong stimulus is applied at the peak of depolarization (at 30mV).
What is likely to happen?
A. A new action potential is immediately generated
B. The strength of the stimulus determines if a new action potential is generated
C. No new action potential will be generated
D. The action potential will be halted and the membrane potential returns to rest
3. How is an action potential propagated across a cell membrane?
A. An influx of Na+ ions in one patch of the membrane depolarizes the membrane, serving as the
depolarizing current for adjacent patches
B. The entire cell membrane depolarizes simultaneously
C. Depolarization in one patch of the membrane repolarizes the adjacent patches, serving as the
depolarizing current for adjacent patches
D. Na+ ions diffuse across the entire cell, depolarizing all patches at once
4. What role do voltage-gated sodium channels play in action potentials?
A. They prevent the action potential from propagating along the axon
B. They initiate the repolarization phase of the action potential
C. They help to restore the resting potential after the action potential has passed
D. They cause the depolarization phase of the action potential by allowing sodium ions to enter
the neuron
5. When two or more graded potentials arrive at the trigger zone, which of the following could
happen?
A. Two inhibitory stimuli may be additive, resulting in higher excitability
B. An excitatory and inhibitory signal can cancel each other out
C. Two excitatory stimuli may be additive, resulting in lower excitability
D. All graded potentials arriving at the trigger zone will result in higher excitability
6. Suppose an excitatory postsynaptic potential (EPSP) is generated at the dendrites of a neuron.
This EPSP then spreads through passive conduction across the membrane to reach the trigger
zone of the axon. If the EPSP's magnitude diminishes significantly by the time it reaches the
trigger zone, what might be the consequences for action potential propagation in this neuron?
A. The neuron would propagate the action potential with increased frequency
B. The neuron would still propagate the action potential with unchanged frequency
C. The neuron would not propagate an action potential due to insufficient depolarization at the
trigger zone
D. The neuron would propagate multiple simultaneous action potentials
Downloaded by Felix Mungai ()
FORM D
Name: ________________ Student Number: _____________
Question(s) needing attention: ________________
UNIVERSITY OF TORONTO
Faculty of Arts and Science
Department of Physiology
2023 Summer PSL300H1-S-LEC5101 – Term Test 1
Duration: 50 minutes (25 questions total; 1 mark each)
*No aids allowed.
DO NOT BEGIN UNTIL INSTRUCTED TO DO SO
INSTRUCTIONS
1. To ‘bubble in’ numbers and letters, it is best to use an HB pencil, in case you make an error.
Ballpoint pen cannot be erased. Do not make any stray marks on your scantron outside of
boxes. Make sure you fill in the ENTIRE CIRCLE.
2. Fill in all of the information in the box on the left-hand side of the form. Print clearly. In the
“FORM CODE” box on the scantron, indicate which “FORM” (A, B, C or D) is indicated on
the top of the first page of your test.
3. On the right-hand side of the form fill in your STUDENT NUMBER (the blocks first, then
code below). For a 9-digit student number, insert a ZERO in the FIRST box. Be very
careful to code your student number correctly.
4. On the BACK print in your LAST NAME and GIVEN NAME (print in block letters). Sign
the form beside “SIGNATURE”.
5. Complete your answer card BEFORE the end of the exam, as you go along. No extra time is
given at the end to transfer answers to the scantron.
6. BOTH SCANTRON AND TEST BOOKLET MUST BE HANDED IN AT END OF THE EXAM.
Invigilators are not permitted to interpret questions to individual students. If you think that a
question is ambiguous, answer it as you understand it, then make a note at the top of this page (not
your answer card). If you do this, print and sign your name on your question book. Select the
MOST correct or MOST incorrect answer. Note spelling or typing errors do not make a
statement incorrect.
Downloaded by Felix Mungai ()
, lOMoARcPSD|6803794
FORM D
1. Identify the correct statement regarding the movement of substances in facilitated diffusion?
A. Movement of substance is against its concentration gradient
B. Movement of substance is up its concentration gradient
C. Movement of substance is down its concentration gradient
D. Movement of substance is independent of its concentration gradient
2. During an action potential, a strong stimulus is applied at the peak of depolarization (at 30mV).
What is likely to happen?
A. A new action potential is immediately generated
B. The strength of the stimulus determines if a new action potential is generated
C. No new action potential will be generated
D. The action potential will be halted and the membrane potential returns to rest
3. How is an action potential propagated across a cell membrane?
A. An influx of Na+ ions in one patch of the membrane depolarizes the membrane, serving as the
depolarizing current for adjacent patches
B. The entire cell membrane depolarizes simultaneously
C. Depolarization in one patch of the membrane repolarizes the adjacent patches, serving as the
depolarizing current for adjacent patches
D. Na+ ions diffuse across the entire cell, depolarizing all patches at once
4. What role do voltage-gated sodium channels play in action potentials?
A. They prevent the action potential from propagating along the axon
B. They initiate the repolarization phase of the action potential
C. They help to restore the resting potential after the action potential has passed
D. They cause the depolarization phase of the action potential by allowing sodium ions to enter
the neuron
5. When two or more graded potentials arrive at the trigger zone, which of the following could
happen?
A. Two inhibitory stimuli may be additive, resulting in higher excitability
B. An excitatory and inhibitory signal can cancel each other out
C. Two excitatory stimuli may be additive, resulting in lower excitability
D. All graded potentials arriving at the trigger zone will result in higher excitability
6. Suppose an excitatory postsynaptic potential (EPSP) is generated at the dendrites of a neuron.
This EPSP then spreads through passive conduction across the membrane to reach the trigger
zone of the axon. If the EPSP's magnitude diminishes significantly by the time it reaches the
trigger zone, what might be the consequences for action potential propagation in this neuron?
A. The neuron would propagate the action potential with increased frequency
B. The neuron would still propagate the action potential with unchanged frequency
C. The neuron would not propagate an action potential due to insufficient depolarization at the
trigger zone
D. The neuron would propagate multiple simultaneous action potentials
Downloaded by Felix Mungai ()
