BMS TEST 2 UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
Question:
1. Adjacent cardiac muscle cells are joined end to end at
structures called _____, which contain desmosomes that
hold the cells together, and gap junctions which connect
the cells electrically.
Answer:
intercalated disks
Question:
2. If prolonged exercise intensity about 70% of the
maximum rate of ATP breakdown, ______ contributes an
increasingly significant fraction of the total ATP generated
within skeletal muscle.
a. oxidative phoshorylation
b. glycolysis
c. nuclear fission
d. gluconeogenesis
e. creatine phosphate
Answer:
B
Question:
3. Which of these describe mechanisms that remove Ca2+
from the cytosol of cardiac muscle cells after
contraction?
a. Na+/Ca2+ countertransporters in the sarcoplasmic
reticulum
b. Ca2+-ATPase pumps in the sarcoplasmic reticulum
c. Na+/Ca2+ co-transporters in the sarcolemma
d. Ca2+-ATPase pumps in the sarcolemma
e. Na+/Ca2+ coutertransporters in the sarcolemma
Answer:
B, D, E
Question:
4. Calcium binds to this protein, causing shape change that
moves tropomyosin
Answer:
troponin
,Question:
5. Voltage-sensing protein in its membrane changes
conformation during action potential propogation
Answer:
transverse tubules
Question:
6. Ryanodine receptor in its membrane allows calcium to
flow into cytosol
Answer:
sarcoplasmic reticulum
Question:
7. Elongated protein keeping cross-bridge binding sites
blocked when cytosolic Ca2+ is in low concentrations
Answer:
tropomyosin
Question:
8. Cross-bridges bind to this protein, which generates
contraction force
Answer:
Actin
Question:
9. Arrange the following steps in order they occur during
signaling at a neuromuscular junction in order from top to
bottom, put the one step that does not actually occur at
the bottom of the list.
a. Ca2+ induces vesicles to bind with the membrane,
releasing acetylcholine
b. The opening of the ligand-gated receptor allows both
Na+ and K+ to diffuse through the muscle cell membrane
c. Depolarization of motor neuron terminals opens
voltage-sensitive Ca2+ channels
d. Acetylcholine diffuses across the cleft and binds to
nicotinic-type ionotropic receptor
e. the motor end plate depolarizes toward threshold
f. ligand-gated Ca2+ channels in motor neuron axon
terminals allow Ca2+ to enter
Answer:
C, A, D, B, E, F
, Question:
10. The three basic types of muscle are
a. concentric
b. smooth
c. obtuse
d. skeletal
e. cardiac
f. rough
Answer:
B, D, E
Question:
11. A muscle contraction in which the muscle develops
tension but does not shorten is called an _____ contraction
a. ectopic
b. isometric
c. eccentric
d. isotonic
Answer:
isometric
Question:
12. In skeletal muscle, the protein ____ regulates the position
of tropomyosin on actin, thereby regulating cross-bridge
binding.
Answer:
troponin
Question:
13. The synapse at which activation of skeletal muscle fibers
occurs is called the
a. neuromuscular junction
b. tight junction
c. adherens junction
d. acetylcholine junction
Answer:
a
CORRECT ANSWERS
Question:
1. Adjacent cardiac muscle cells are joined end to end at
structures called _____, which contain desmosomes that
hold the cells together, and gap junctions which connect
the cells electrically.
Answer:
intercalated disks
Question:
2. If prolonged exercise intensity about 70% of the
maximum rate of ATP breakdown, ______ contributes an
increasingly significant fraction of the total ATP generated
within skeletal muscle.
a. oxidative phoshorylation
b. glycolysis
c. nuclear fission
d. gluconeogenesis
e. creatine phosphate
Answer:
B
Question:
3. Which of these describe mechanisms that remove Ca2+
from the cytosol of cardiac muscle cells after
contraction?
a. Na+/Ca2+ countertransporters in the sarcoplasmic
reticulum
b. Ca2+-ATPase pumps in the sarcoplasmic reticulum
c. Na+/Ca2+ co-transporters in the sarcolemma
d. Ca2+-ATPase pumps in the sarcolemma
e. Na+/Ca2+ coutertransporters in the sarcolemma
Answer:
B, D, E
Question:
4. Calcium binds to this protein, causing shape change that
moves tropomyosin
Answer:
troponin
,Question:
5. Voltage-sensing protein in its membrane changes
conformation during action potential propogation
Answer:
transverse tubules
Question:
6. Ryanodine receptor in its membrane allows calcium to
flow into cytosol
Answer:
sarcoplasmic reticulum
Question:
7. Elongated protein keeping cross-bridge binding sites
blocked when cytosolic Ca2+ is in low concentrations
Answer:
tropomyosin
Question:
8. Cross-bridges bind to this protein, which generates
contraction force
Answer:
Actin
Question:
9. Arrange the following steps in order they occur during
signaling at a neuromuscular junction in order from top to
bottom, put the one step that does not actually occur at
the bottom of the list.
a. Ca2+ induces vesicles to bind with the membrane,
releasing acetylcholine
b. The opening of the ligand-gated receptor allows both
Na+ and K+ to diffuse through the muscle cell membrane
c. Depolarization of motor neuron terminals opens
voltage-sensitive Ca2+ channels
d. Acetylcholine diffuses across the cleft and binds to
nicotinic-type ionotropic receptor
e. the motor end plate depolarizes toward threshold
f. ligand-gated Ca2+ channels in motor neuron axon
terminals allow Ca2+ to enter
Answer:
C, A, D, B, E, F
, Question:
10. The three basic types of muscle are
a. concentric
b. smooth
c. obtuse
d. skeletal
e. cardiac
f. rough
Answer:
B, D, E
Question:
11. A muscle contraction in which the muscle develops
tension but does not shorten is called an _____ contraction
a. ectopic
b. isometric
c. eccentric
d. isotonic
Answer:
isometric
Question:
12. In skeletal muscle, the protein ____ regulates the position
of tropomyosin on actin, thereby regulating cross-bridge
binding.
Answer:
troponin
Question:
13. The synapse at which activation of skeletal muscle fibers
occurs is called the
a. neuromuscular junction
b. tight junction
c. adherens junction
d. acetylcholine junction
Answer:
a
