BIOL460 EXAM V QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS VERIFIED GRADED A++
The majority of the Ca2+ required for skeletal muscle contraction comes from the
_____ _____.
SR
Calcium that is needed to activate cross bridge cycling in smooth muscle mainly
comes from
a. the sarcoplasmic reticulum.
b. the extracellular environment.
c. the sarcoplasm.
d. dense protein bodies.
b. the extracellular environment.
When discussing pacemaker potentials, the scientist who first noticed these
labeled the channels as IF channels. The I stands for current while the F stands
for _____.
funny
_____ primarily makes up the thin filament while _____ primarily makes up the
thick filament.
a. Actin; myosin
b. Myosin; actin
c. Actin; troponin
, d. Troponin; myosin
e. Myosin; tropomyosin
f. Troponin; actin
g. Myosin; troponin
h. Tropomyosin; myosin
i. Actin; tropomyosin
j. Tropomyosin; actin
a. Actin; myosin
What structure runs the length of the sarcomere and contributes to the elastic
recoil in muscle?
a. titin
b. tropomyosin
c. myosin
d. keratin
e. actin
f. troponin
a. titin
Skeletal muscles with a low innervation ratio, such as 1:23, have a low degree of
neural control, i.e. they are not very precise.
a. true
b. false
b. false
which chamber of the heart is labeled A?
COMPLETE SOLUTIONS VERIFIED GRADED A++
The majority of the Ca2+ required for skeletal muscle contraction comes from the
_____ _____.
SR
Calcium that is needed to activate cross bridge cycling in smooth muscle mainly
comes from
a. the sarcoplasmic reticulum.
b. the extracellular environment.
c. the sarcoplasm.
d. dense protein bodies.
b. the extracellular environment.
When discussing pacemaker potentials, the scientist who first noticed these
labeled the channels as IF channels. The I stands for current while the F stands
for _____.
funny
_____ primarily makes up the thin filament while _____ primarily makes up the
thick filament.
a. Actin; myosin
b. Myosin; actin
c. Actin; troponin
, d. Troponin; myosin
e. Myosin; tropomyosin
f. Troponin; actin
g. Myosin; troponin
h. Tropomyosin; myosin
i. Actin; tropomyosin
j. Tropomyosin; actin
a. Actin; myosin
What structure runs the length of the sarcomere and contributes to the elastic
recoil in muscle?
a. titin
b. tropomyosin
c. myosin
d. keratin
e. actin
f. troponin
a. titin
Skeletal muscles with a low innervation ratio, such as 1:23, have a low degree of
neural control, i.e. they are not very precise.
a. true
b. false
b. false
which chamber of the heart is labeled A?
