BIO 264 Final Exam UPDATED Study
Guide CORRECT ANSWERS
QUESTIONS
- Once excitation-contraction coupling has occurred, calcium ion
concentration increases dramatically in the:
a. sarcoplasmic reticulum
b. cytosol of the muscle fiber
c. sarcolemma
d. terminal cisterna
e. there is no change in calcium concentration - CORRECT
ANSWERS b. cytosol of the muscle fiber
As Lisa drove home, she was suddenly alerted to the sound of a
blaring horn and realized she had drifted off to sleep. Which nervous
system division dominated when she was startled awake?
a. sensory nervous system
b. sympathetic nervous system
c. parasympathetic nervous system
d. somatic nervous system - CORRECT ANSWERS b.
sympathetic nervous system
Jorge tried to pick up his sofa but discover that it is much heavier than
he expected. What must occur in the muscle to increase tension so he
can pick up this heavy piece of furniture?
,a. tetanic spasm
b. recruitment of additional motor units
c. pliometric contraction
d. isotonic eccentric contractions - CORRECT ANSWERS b.
recruitment of additional motor units
The chemical force for which of the following ions is directed into the
cell?
a. potassium only
b. sodium only
c. calcium only
d. both potassium and sodium
e. both sodium and calcium - CORRECT ANSWERS e. both
sodium and calcium
Which fiber type helps Frances stand for hours in her job as a nurse?
a. type I fiber
b. typer IIa fiber
c. type IIx fiber
d. Type III fiber - CORRECT ANSWERS a. type I fiber
The opening of a chloride channel acts to ________ the development
of an action potential at the axon hillock.
,a. stimulate
b. inhibit
c. facilitate
d. further
e. enhance - CORRECT ANSWERS b. inhibit
If a resting axon increases its permeability to potassium ions: -
CORRECT ANSWERS the eflux of K+ will lead to membrane
to hyperpolarization.
Which number of the graph represents when voltage-gated sodium
channels are open? - CORRECT ANSWERS 2
What effect does a B2 agonist have on the diameter of respiratory
passages? - CORRECT ANSWERS The diameter of the
respiratory passageways will increase.
The all-or-none principle, associated with the action potential, states
that _____________. - CORRECT ANSWERS once
membrane potential reaches threshold, an action potential will be
generated and that action potential will always be the same
magnitude.
The force generate by a single muscle fiber can be increased by -
CORRECT ANSWERS increasing frequency of action
potentials only.
, The influx of calcium into the axon terminal of a chemical synapse is
responsible for which of the following?
a. initiation of an action potential
b. termination of an action potential potential
c. fusion of vesicles to the membrane and of exocytosis
neurotransmitter
d. diffusion of the neurotransmitter across the membrane and into the
cleft
e. movement of calcium through gap junctions - CORRECT
ANSWERS c. fusion of vesicles to the membrane and of
exocytosis neurotransmitter
What do skeletal muscle contractions share in common with smooth
muscle contractions? - CORRECT ANSWERS Both types of
contractions result from thick and thin filaments sliding past one
another.
During the cross-bridge cycle, ATP binding to myosin causes which
of the following? - CORRECT ANSWERS The myosin head
to detach to actin.
Which of the following is the voltage sensor that imitates an increase
in cytoplasmic calcium in response to an action potential?
a. dihydropyridine receptor
b. ryanodine receptor
Guide CORRECT ANSWERS
QUESTIONS
- Once excitation-contraction coupling has occurred, calcium ion
concentration increases dramatically in the:
a. sarcoplasmic reticulum
b. cytosol of the muscle fiber
c. sarcolemma
d. terminal cisterna
e. there is no change in calcium concentration - CORRECT
ANSWERS b. cytosol of the muscle fiber
As Lisa drove home, she was suddenly alerted to the sound of a
blaring horn and realized she had drifted off to sleep. Which nervous
system division dominated when she was startled awake?
a. sensory nervous system
b. sympathetic nervous system
c. parasympathetic nervous system
d. somatic nervous system - CORRECT ANSWERS b.
sympathetic nervous system
Jorge tried to pick up his sofa but discover that it is much heavier than
he expected. What must occur in the muscle to increase tension so he
can pick up this heavy piece of furniture?
,a. tetanic spasm
b. recruitment of additional motor units
c. pliometric contraction
d. isotonic eccentric contractions - CORRECT ANSWERS b.
recruitment of additional motor units
The chemical force for which of the following ions is directed into the
cell?
a. potassium only
b. sodium only
c. calcium only
d. both potassium and sodium
e. both sodium and calcium - CORRECT ANSWERS e. both
sodium and calcium
Which fiber type helps Frances stand for hours in her job as a nurse?
a. type I fiber
b. typer IIa fiber
c. type IIx fiber
d. Type III fiber - CORRECT ANSWERS a. type I fiber
The opening of a chloride channel acts to ________ the development
of an action potential at the axon hillock.
,a. stimulate
b. inhibit
c. facilitate
d. further
e. enhance - CORRECT ANSWERS b. inhibit
If a resting axon increases its permeability to potassium ions: -
CORRECT ANSWERS the eflux of K+ will lead to membrane
to hyperpolarization.
Which number of the graph represents when voltage-gated sodium
channels are open? - CORRECT ANSWERS 2
What effect does a B2 agonist have on the diameter of respiratory
passages? - CORRECT ANSWERS The diameter of the
respiratory passageways will increase.
The all-or-none principle, associated with the action potential, states
that _____________. - CORRECT ANSWERS once
membrane potential reaches threshold, an action potential will be
generated and that action potential will always be the same
magnitude.
The force generate by a single muscle fiber can be increased by -
CORRECT ANSWERS increasing frequency of action
potentials only.
, The influx of calcium into the axon terminal of a chemical synapse is
responsible for which of the following?
a. initiation of an action potential
b. termination of an action potential potential
c. fusion of vesicles to the membrane and of exocytosis
neurotransmitter
d. diffusion of the neurotransmitter across the membrane and into the
cleft
e. movement of calcium through gap junctions - CORRECT
ANSWERS c. fusion of vesicles to the membrane and of
exocytosis neurotransmitter
What do skeletal muscle contractions share in common with smooth
muscle contractions? - CORRECT ANSWERS Both types of
contractions result from thick and thin filaments sliding past one
another.
During the cross-bridge cycle, ATP binding to myosin causes which
of the following? - CORRECT ANSWERS The myosin head
to detach to actin.
Which of the following is the voltage sensor that imitates an increase
in cytoplasmic calcium in response to an action potential?
a. dihydropyridine receptor
b. ryanodine receptor
