Biol 546 exams
Study online at
https://quizlet.com/_6o8plv
1.All of the following are true statements about the action potential EXCEPT:
a) Opening of the voltage-gated Na-channels will move the membrane
poten- tial to the equilibrium potential of Na.
b) Opening of voltage-gated K-channels will move the membrane potential
to the equilibrium potential of K.
c) The Hodgkin cycle causes the fast change in membrane potential during
the rising phase of the action potential.
d) The falling phase of the AP is mainly due to the movement of K+ ions.
e) Voltage-gated Na-channels stay open longer than voltage-gated K-chan-
nels.: e) Voltage-gated Na-channels stay open longer than voltage-
gated K-chan- nels. ***
2.Scientists discovered a new animal species with nerve cells
physiologically similar to nerve cells found in other animals. The membrane
potential when only sodium ions can move across the membrane was
measured at +116 mV. What is the sodium concentration outside the nerve
cell if the sodium concentration inside the cell is 1 mM?
a) 1 M
b) 0.232 M
c) 0.116 M
d) 0.58 M
e) 0.1 M: e) 0.1 M
3.Which neurotransmitter binds to the nicotinic ACh receptor?
a) muscarine
b) atopine
c) norepinephrine
d) glutamate
e) None of the above: e) None of the above
4.The period of excitability of neuron during which both Na+ and K+
activation can occur is called the
a) interphase period.
b) relative refractory period.
c) absolute refractory period.
d) hyperexcitable period.
e) latent period: b) relative refractory period.
5.Excitation of the cone cell by blue light results in the production of an
action potential in the connected bipolar cell.
a) true
b) false: b) false
, Biol 546 exams
Study online at
https://quizlet.com/_6o8plv
6.Which concept is the defining feature of the discipline of physiology?
a) Descent with modification
b) Homeostasis
c) Evolution
d) Equilibrium
e) Differentiation: b) Homeostasis
7.Stimulation of a hair cell results in changes in the hair cell membrane
such as
a) opening of voltage-gated Na+ channels.
b) opening of voltage-gated K+ channels.
c) answers a and b.
d) none of the above: d) none of the above
8.What is the general purpose of positive feedback mechanisms?
a) To maintain a constant internal environment
b) To anticipate changes in the environment
c) To return a variable toward the set point
d) To bring about a rapid change in the body
e) To detect changes in the external environment: d) To bring about a
rapid change in the body
9.You are designing a drug. You'd like to deliver the drug by creating a skin
patch that is impregnated with the drug and allowing the drug to diffuse
through the layers of the skin to reach the underlying tissues and
bloodstream. Which of these chemical changes might you make to increase
the number of drug molecules that diffuse through the layers of skin cells?
a) Increasing the number of nitrogen atoms in the drug
b) Decreasing the number of nonpolar groups in the drug
c) Decreasing the number of polar groups in the drug
d) Increasing the number of oxygen atoms in the drug: c) Decreasing
the number of polar groups in the
10.What comes last in the release of neurotransmitters from synaptic
vesi- cles?
a) fusion.
b) priming.
c) docking
d) opening of Ca channels: a) fusion.
11.What category do hair cells in the organ of Corti belong to?
a) Mechanoreceptors
b) Chemoreceptors
c) Nociceptors
, Biol 546 exams
Study online at
https://quizlet.com/_6o8plv
d) Photoreceptors
e) Proprioceptors: a) Mechanoreceptors
12.A complete lesion (destruction) of the right lateral geniculate
nucleus produces which one of the following visual field defects?
a) loss of lateral inhibition
b) loss of the left visual field
c) loss of both left and right visual field
d) loss of color vision.
e) none of the above: b) loss of the left visual field
13.The optic nerve is composed of axons from which of the following
retinal cell types?
a) bipolar
b) ganglion
c) amacrine
d) horizontal
e) answers a and b: b) ganglion
14.The physiological explanation for our ability to differentiate among
sounds of different pitches (frequencies) is because
a) hair cells respond to high pitch sound by moving into one direction and
to low pitch by moving into the opposite direction.
b) the basilar membrane depolarizes and hyperpolarizes at multiple
locations depending on pitch.
c) hair cells at different locations on the basilar membrane respond to
different sound frequencies.
d) the basilar membrane has more hair cells near the oval window and
fewer hair cells near the apex.
e) high frequency sounds allows K+ to enter the hair cells and low
frequency sounds allows Na+ to enter the hair cells.: c) hair cells at
different locations on the basilar membrane respond to different sound
frequencies.
15.If the ATP-generating mechanisms in a nerve cell are poisoned and the
nerve cell depletes its ATP reserves, what will happen to the resting
membrane potential of this cell?
a) The resting membrane potential will become more negative.
b) The resting membrane potential will become less negative
c) The concentration gradient for Na+ will remain the same.
d) The resting membrane potential will eventually become positive inside
with respect to outside.
e) There will be no change in the resting membrane potential.: b) The
, Biol 546 exams
Study online at
restinghttps://quizlet.com/_6o8plv
membrane potential will become less negative.
Study online at
https://quizlet.com/_6o8plv
1.All of the following are true statements about the action potential EXCEPT:
a) Opening of the voltage-gated Na-channels will move the membrane
poten- tial to the equilibrium potential of Na.
b) Opening of voltage-gated K-channels will move the membrane potential
to the equilibrium potential of K.
c) The Hodgkin cycle causes the fast change in membrane potential during
the rising phase of the action potential.
d) The falling phase of the AP is mainly due to the movement of K+ ions.
e) Voltage-gated Na-channels stay open longer than voltage-gated K-chan-
nels.: e) Voltage-gated Na-channels stay open longer than voltage-
gated K-chan- nels. ***
2.Scientists discovered a new animal species with nerve cells
physiologically similar to nerve cells found in other animals. The membrane
potential when only sodium ions can move across the membrane was
measured at +116 mV. What is the sodium concentration outside the nerve
cell if the sodium concentration inside the cell is 1 mM?
a) 1 M
b) 0.232 M
c) 0.116 M
d) 0.58 M
e) 0.1 M: e) 0.1 M
3.Which neurotransmitter binds to the nicotinic ACh receptor?
a) muscarine
b) atopine
c) norepinephrine
d) glutamate
e) None of the above: e) None of the above
4.The period of excitability of neuron during which both Na+ and K+
activation can occur is called the
a) interphase period.
b) relative refractory period.
c) absolute refractory period.
d) hyperexcitable period.
e) latent period: b) relative refractory period.
5.Excitation of the cone cell by blue light results in the production of an
action potential in the connected bipolar cell.
a) true
b) false: b) false
, Biol 546 exams
Study online at
https://quizlet.com/_6o8plv
6.Which concept is the defining feature of the discipline of physiology?
a) Descent with modification
b) Homeostasis
c) Evolution
d) Equilibrium
e) Differentiation: b) Homeostasis
7.Stimulation of a hair cell results in changes in the hair cell membrane
such as
a) opening of voltage-gated Na+ channels.
b) opening of voltage-gated K+ channels.
c) answers a and b.
d) none of the above: d) none of the above
8.What is the general purpose of positive feedback mechanisms?
a) To maintain a constant internal environment
b) To anticipate changes in the environment
c) To return a variable toward the set point
d) To bring about a rapid change in the body
e) To detect changes in the external environment: d) To bring about a
rapid change in the body
9.You are designing a drug. You'd like to deliver the drug by creating a skin
patch that is impregnated with the drug and allowing the drug to diffuse
through the layers of the skin to reach the underlying tissues and
bloodstream. Which of these chemical changes might you make to increase
the number of drug molecules that diffuse through the layers of skin cells?
a) Increasing the number of nitrogen atoms in the drug
b) Decreasing the number of nonpolar groups in the drug
c) Decreasing the number of polar groups in the drug
d) Increasing the number of oxygen atoms in the drug: c) Decreasing
the number of polar groups in the
10.What comes last in the release of neurotransmitters from synaptic
vesi- cles?
a) fusion.
b) priming.
c) docking
d) opening of Ca channels: a) fusion.
11.What category do hair cells in the organ of Corti belong to?
a) Mechanoreceptors
b) Chemoreceptors
c) Nociceptors
, Biol 546 exams
Study online at
https://quizlet.com/_6o8plv
d) Photoreceptors
e) Proprioceptors: a) Mechanoreceptors
12.A complete lesion (destruction) of the right lateral geniculate
nucleus produces which one of the following visual field defects?
a) loss of lateral inhibition
b) loss of the left visual field
c) loss of both left and right visual field
d) loss of color vision.
e) none of the above: b) loss of the left visual field
13.The optic nerve is composed of axons from which of the following
retinal cell types?
a) bipolar
b) ganglion
c) amacrine
d) horizontal
e) answers a and b: b) ganglion
14.The physiological explanation for our ability to differentiate among
sounds of different pitches (frequencies) is because
a) hair cells respond to high pitch sound by moving into one direction and
to low pitch by moving into the opposite direction.
b) the basilar membrane depolarizes and hyperpolarizes at multiple
locations depending on pitch.
c) hair cells at different locations on the basilar membrane respond to
different sound frequencies.
d) the basilar membrane has more hair cells near the oval window and
fewer hair cells near the apex.
e) high frequency sounds allows K+ to enter the hair cells and low
frequency sounds allows Na+ to enter the hair cells.: c) hair cells at
different locations on the basilar membrane respond to different sound
frequencies.
15.If the ATP-generating mechanisms in a nerve cell are poisoned and the
nerve cell depletes its ATP reserves, what will happen to the resting
membrane potential of this cell?
a) The resting membrane potential will become more negative.
b) The resting membrane potential will become less negative
c) The concentration gradient for Na+ will remain the same.
d) The resting membrane potential will eventually become positive inside
with respect to outside.
e) There will be no change in the resting membrane potential.: b) The
, Biol 546 exams
Study online at
restinghttps://quizlet.com/_6o8plv
membrane potential will become less negative.
