HLSC 2410 BLOCK 1 EXAM QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS VERIFIED GRADED A++
Which of the following is a shared feature of both primary and active transport?
a. they both transport a substance against their concentration gradient.
b. they both require pores to move a substance across the membrane
c. they both are pumps that bind and use ATP
d. they both move a substance down its concentration gradient
a. they both transport a substance against their concentration gradient
At the resting membrane potential of a neuron, the cell membrane of a neuron is
most permeable to which of the following ions?
a. chloride
b. sodium
c. calcium
d. potassium
d. potassium
Two excitatory post-synaptic potentials (EPSPs) occur at the same time but at
different locations of the cell body of a neuron. Together these two EPSPS
produce a shift in membrane potential of the cell body. This is an example of:
a. membrane repolarization
b. temporal summation
,c. spatial summation
d. membrane hyperpolarization
c. spatial summation
In the cell, a thin shell of charged ions form along the_________ and generate
a(an) ____________.
a. cell nucleus, nuclear potential
b. cell nucleus, action potential
c. cell membrane, membrane potential
d. cell membrane, electrogenic pump
c. cell membrane, membrane potential
Which of the following is part of the afferent pathway of negative feedback
regulation in response to an increase in body temperature?
a. sensory neurons activate a decrease in blood flow to the skin
b. the integrating center activates motor neurons to skeletal muscle
c. motor nerves initiate sweating
d. sensory receptors detect an increase in body temperature
d. sensory receptors detect an increase in body temperature
Which of the following is the most soluble in water?
a. sodium ions
b. steroid hormones
c. cholesterol
d. non-polar solutes
a. sodium ions
,A neurotransmitter binds to a channel in the plasma membrane. This binding then
stimulates the channel to open and allows sodium to pass through. This channel
is an example of a (an):
a. Gap junction
b. G-protein coupled receptor
c. metabotropic receptor
d. ionotropic receptor
d. ionotropic receptor
Opening a Cl- channel allows Cl- ions to move __________ the cell which then
makes the inside of the cell ______ negative?
a. Inside, less
b. Outside, less
c. Outside, more
d. Inside, more
d. inside, more
Which of the following correctly describes a difference between the extracellular
fluid (ECF) and the intracellular fluid (ICF) compartment?
a. The ECF has a lower concentration of Na+ compared to the ICF.
b. More of the body's water is found in the ECF compared to the ICF.
c. The ICF has a higher concentration of K+ compared to the ECF.
d. The ECF compartment includes plasma and the ICF compartment includes
interstitial fluid.
c. The ICF has a higher concentration of K+ compared to the ECF.
, The phosopholipid bilayer of the plasma membrane is described as being a
selective barrier because it:
a. restricts the movement of some substances but allows for the movements of
other substances across the membrane.
b. restricts the movement of all lipids across the membrane.
c. is more permeable to ions than it is to steroid hormones.
d. only allows for the movement of gases across the membrane.
a. restricts the movement of some substances but allows for the movements of other
substances across the membrane.
Which one of the following ion movements is responsible for the depolarization
phase of a neuronal action potential ?
a. movement of potassium out of cell through voltage gated channels
b. movement of sodium out of the cell through voltage gated channels
c. movement of potassium into the cell through voltage gated channels
d. movement of sodium into the cell through voltage gated channels
d. movement of sodium into the cell through voltage gated channels
Influx of which of the following ions results in fusion of pre-synaptic vesicles with
the plasma membrane and exocytosis of neurotransmitter into the synaptic cleft?
a. GABA
b. Chloride
c. Calcium
d. Potassium
c. calcium
COMPLETE SOLUTIONS VERIFIED GRADED A++
Which of the following is a shared feature of both primary and active transport?
a. they both transport a substance against their concentration gradient.
b. they both require pores to move a substance across the membrane
c. they both are pumps that bind and use ATP
d. they both move a substance down its concentration gradient
a. they both transport a substance against their concentration gradient
At the resting membrane potential of a neuron, the cell membrane of a neuron is
most permeable to which of the following ions?
a. chloride
b. sodium
c. calcium
d. potassium
d. potassium
Two excitatory post-synaptic potentials (EPSPs) occur at the same time but at
different locations of the cell body of a neuron. Together these two EPSPS
produce a shift in membrane potential of the cell body. This is an example of:
a. membrane repolarization
b. temporal summation
,c. spatial summation
d. membrane hyperpolarization
c. spatial summation
In the cell, a thin shell of charged ions form along the_________ and generate
a(an) ____________.
a. cell nucleus, nuclear potential
b. cell nucleus, action potential
c. cell membrane, membrane potential
d. cell membrane, electrogenic pump
c. cell membrane, membrane potential
Which of the following is part of the afferent pathway of negative feedback
regulation in response to an increase in body temperature?
a. sensory neurons activate a decrease in blood flow to the skin
b. the integrating center activates motor neurons to skeletal muscle
c. motor nerves initiate sweating
d. sensory receptors detect an increase in body temperature
d. sensory receptors detect an increase in body temperature
Which of the following is the most soluble in water?
a. sodium ions
b. steroid hormones
c. cholesterol
d. non-polar solutes
a. sodium ions
,A neurotransmitter binds to a channel in the plasma membrane. This binding then
stimulates the channel to open and allows sodium to pass through. This channel
is an example of a (an):
a. Gap junction
b. G-protein coupled receptor
c. metabotropic receptor
d. ionotropic receptor
d. ionotropic receptor
Opening a Cl- channel allows Cl- ions to move __________ the cell which then
makes the inside of the cell ______ negative?
a. Inside, less
b. Outside, less
c. Outside, more
d. Inside, more
d. inside, more
Which of the following correctly describes a difference between the extracellular
fluid (ECF) and the intracellular fluid (ICF) compartment?
a. The ECF has a lower concentration of Na+ compared to the ICF.
b. More of the body's water is found in the ECF compared to the ICF.
c. The ICF has a higher concentration of K+ compared to the ECF.
d. The ECF compartment includes plasma and the ICF compartment includes
interstitial fluid.
c. The ICF has a higher concentration of K+ compared to the ECF.
, The phosopholipid bilayer of the plasma membrane is described as being a
selective barrier because it:
a. restricts the movement of some substances but allows for the movements of
other substances across the membrane.
b. restricts the movement of all lipids across the membrane.
c. is more permeable to ions than it is to steroid hormones.
d. only allows for the movement of gases across the membrane.
a. restricts the movement of some substances but allows for the movements of other
substances across the membrane.
Which one of the following ion movements is responsible for the depolarization
phase of a neuronal action potential ?
a. movement of potassium out of cell through voltage gated channels
b. movement of sodium out of the cell through voltage gated channels
c. movement of potassium into the cell through voltage gated channels
d. movement of sodium into the cell through voltage gated channels
d. movement of sodium into the cell through voltage gated channels
Influx of which of the following ions results in fusion of pre-synaptic vesicles with
the plasma membrane and exocytosis of neurotransmitter into the synaptic cleft?
a. GABA
b. Chloride
c. Calcium
d. Potassium
c. calcium
