Umaine BIO 208 Exam 2 Questions With Complete
Solutions
____ is primarily red sk. muscle?
ocular muscle
gastocnemius muscle
soleus muscle
A-C are ALL red skeletal muscles
None are red skeletal muscles Correct Answers Soleus muscle
** A graded potential in a neuron has all of the following
characteristics EXCEPT Correct Answers it regenerates itself
** If the sodium-potassium pumps in the cell membrane fail to
function, all below happen EXCEPT Correct Answers the
INside of the cell wall have a resting potential that is more
negative than normal
** The evidence supports the view that the "self" (you or your
personality) resides in... Correct Answers ...a large number of
cell groups clustered at various locations throughout your brain
** Which muscle type is specialized for shortest length during
maximum contraction? Correct Answers Smooth muscle
A graded potential in a neuron has all of the following
characteristics except: Correct Answers it regenerates itself
A lack of exercise would
A.cause bones to become thicker.
B.cause bones to store more calcium.
,C.result in thin, brittle bones.
D.increase the length of a bone.
E.have no effect on a bone. Correct Answers C.result in thin,
brittle bones
A person whose genetic makeup makes them a better marathon
runner than a sprinter probably has more __________ in their
leg muscles.
A.fast fibers
B.intermediate fibers
C.slow fibers
D.noncontractile fibers
E.dark fibers Correct Answers C.slow fibers
A sudden increase in blood pressure detected by baroreceptors
in the walls of large arteries near the
heart will cause: Correct Answers Parasympathetic reduction of
heart rate and sympathetic dilation of blood vessels
action potentials:
Normally decay rapidly as they spread through a cell.
Vary inversely in amplitude with the magnitude of stimulus that
triggers A.P.'s
Vary directly in amplitude with the magnitude of the stimulus
that triggers them.
Do NOT vary in amplitude with the size of the stimulus that
triggers the A.P.'s
None of the above (i.e. ALL are true characteristics of A.P.'s)
Correct Answers Do NOT vary in amplitude with the size of the
stimulus that triggers the A.P.'s
,Active sites on actin become available for binding when
A.actin binds to troponin.
B.troponin binds to tropomyosin.
C.calcium binds to troponin.
D.calcium binds to tropomyosin.
E.myosin binds to troponin Correct Answers C.calcium binds to
troponin
Active sites on actin become available for binding when Correct
Answers calcium binds to troponin
Active sites on actin become available for binding when...
Correct Answers ...calcium binds to troponin
Activities that require anaerobic endurance
A.require maximal contraction of muscles for short periods of
time.
B.do not use ATP very quickly.
C.usually do not cause an individual to develop an oxygen debt.
D.do not rely on the energy reserves of creatine phosphate.
E.have characteristics of all of these. Correct Answers A.require
maximal contraction of muscles for short periods of time
Another name for the patellar reflex is
A.the knee jerk reflex.
B.the spinal short reflex.
C.the dorsiflexion reflex.
D.the long spinal reflex.
E.none of these. Correct Answers the knee jerk reflex
At rest, active sites on the actin are blocked by
, A.myosin molecules.
B.troponin molecules.
C.tropomyosin molecules.
D.ATP molecules.
E.calcium ions. Correct Answers C.tropomyosin molecules
At the normal resting potential of a typical neuron, its ion
exchange pump
A.exchanges 1 intracellular sodium ion for 2 extracellular
potassium ions.
B.exchanges 2 intracellular sodium ions for 1 extracellular
potassium ion.
C.exchanges 3 intracellular sodium ions for 1 extracellular
potassium ion.
D.exchanges 3 intracellular sodium ions for 2 extracellular
potassium ions.
E.exchanges 3 extracellular sodium ions for 2 intracellular
potassium ions. Correct Answers D.exchange 3 intracellular
sodium ions for 2 extracellular potassium ions
At the PEAK of action potential (e.g. +30 mV), all of the
following occurs EXCEPT Correct Answers Membrane
potential has re-polarized
At the PEAK of the action potential (e.g. +30 mV), all of the
following occurs EXCEPT: Correct Answers membrane
potential has repolarized
At what relative length will skeletal muscle contract with an
initial maximum force? Correct Answers at about 1/2 its
maximum length
Solutions
____ is primarily red sk. muscle?
ocular muscle
gastocnemius muscle
soleus muscle
A-C are ALL red skeletal muscles
None are red skeletal muscles Correct Answers Soleus muscle
** A graded potential in a neuron has all of the following
characteristics EXCEPT Correct Answers it regenerates itself
** If the sodium-potassium pumps in the cell membrane fail to
function, all below happen EXCEPT Correct Answers the
INside of the cell wall have a resting potential that is more
negative than normal
** The evidence supports the view that the "self" (you or your
personality) resides in... Correct Answers ...a large number of
cell groups clustered at various locations throughout your brain
** Which muscle type is specialized for shortest length during
maximum contraction? Correct Answers Smooth muscle
A graded potential in a neuron has all of the following
characteristics except: Correct Answers it regenerates itself
A lack of exercise would
A.cause bones to become thicker.
B.cause bones to store more calcium.
,C.result in thin, brittle bones.
D.increase the length of a bone.
E.have no effect on a bone. Correct Answers C.result in thin,
brittle bones
A person whose genetic makeup makes them a better marathon
runner than a sprinter probably has more __________ in their
leg muscles.
A.fast fibers
B.intermediate fibers
C.slow fibers
D.noncontractile fibers
E.dark fibers Correct Answers C.slow fibers
A sudden increase in blood pressure detected by baroreceptors
in the walls of large arteries near the
heart will cause: Correct Answers Parasympathetic reduction of
heart rate and sympathetic dilation of blood vessels
action potentials:
Normally decay rapidly as they spread through a cell.
Vary inversely in amplitude with the magnitude of stimulus that
triggers A.P.'s
Vary directly in amplitude with the magnitude of the stimulus
that triggers them.
Do NOT vary in amplitude with the size of the stimulus that
triggers the A.P.'s
None of the above (i.e. ALL are true characteristics of A.P.'s)
Correct Answers Do NOT vary in amplitude with the size of the
stimulus that triggers the A.P.'s
,Active sites on actin become available for binding when
A.actin binds to troponin.
B.troponin binds to tropomyosin.
C.calcium binds to troponin.
D.calcium binds to tropomyosin.
E.myosin binds to troponin Correct Answers C.calcium binds to
troponin
Active sites on actin become available for binding when Correct
Answers calcium binds to troponin
Active sites on actin become available for binding when...
Correct Answers ...calcium binds to troponin
Activities that require anaerobic endurance
A.require maximal contraction of muscles for short periods of
time.
B.do not use ATP very quickly.
C.usually do not cause an individual to develop an oxygen debt.
D.do not rely on the energy reserves of creatine phosphate.
E.have characteristics of all of these. Correct Answers A.require
maximal contraction of muscles for short periods of time
Another name for the patellar reflex is
A.the knee jerk reflex.
B.the spinal short reflex.
C.the dorsiflexion reflex.
D.the long spinal reflex.
E.none of these. Correct Answers the knee jerk reflex
At rest, active sites on the actin are blocked by
, A.myosin molecules.
B.troponin molecules.
C.tropomyosin molecules.
D.ATP molecules.
E.calcium ions. Correct Answers C.tropomyosin molecules
At the normal resting potential of a typical neuron, its ion
exchange pump
A.exchanges 1 intracellular sodium ion for 2 extracellular
potassium ions.
B.exchanges 2 intracellular sodium ions for 1 extracellular
potassium ion.
C.exchanges 3 intracellular sodium ions for 1 extracellular
potassium ion.
D.exchanges 3 intracellular sodium ions for 2 extracellular
potassium ions.
E.exchanges 3 extracellular sodium ions for 2 intracellular
potassium ions. Correct Answers D.exchange 3 intracellular
sodium ions for 2 extracellular potassium ions
At the PEAK of action potential (e.g. +30 mV), all of the
following occurs EXCEPT Correct Answers Membrane
potential has re-polarized
At the PEAK of the action potential (e.g. +30 mV), all of the
following occurs EXCEPT: Correct Answers membrane
potential has repolarized
At what relative length will skeletal muscle contract with an
initial maximum force? Correct Answers at about 1/2 its
maximum length
