BIOL 2420 Exam 3 – SLCC UPDATED
ACTUAL Questions and CORRECT
Answers
myosin - CORRECT ANSWER - Identify the contractile protein represented in orange.
the length of the A-bands - CORRECT ANSWER - During sarcomere contraction, which
of the following does NOT change length?
troponin; tropomysin; actin - CORRECT ANSWER - During sarcomere contraction, Ca
binds to ______________ , which allows ______________to move and reveal the
______________ active sites for crossbridge formation.
1, 3, 5, 2, 4 - CORRECT ANSWER - Place the following steps of crossbrige formation in
the correct order:
1. AP reaches T-tubules
2. Tropomyosin moves to reveal active sites
3. Ca is released from the SR
4. Crossbridge forms
5. Ca binds to troponin
Latent period (orange) - CORRECT ANSWER - Click on the region of the graph in which
Ca is being released from the sarcoplasmic reticulum.
Summation - CORRECT ANSWER - This graph represents ______________ in a skeletal
muscle fiber.
poliomyelitis - CORRECT ANSWER - Choose the disorder that causes a destruction of
somatic motor neurons.
, B and D are correct
More capillaries
more myoglobin - CORRECT ANSWER - Aerobic, or low-intensity, muscle training
eventually results in
fast-glycolytic - CORRECT ANSWER - A bodybuilder's upper body would contain
extremely well-trained ______________ fibers.
veins - CORRECT ANSWER - In systemic circulation, which type of vessel has the lowest
pressure?
dilation - CORRECT ANSWER - Low O, high CO, or low pH, when detected in a
SPECIFIC CAPILLARY BED, will cause paracrine agents to be released causing
______________ in local arterioles feeding that capillary bed.
skeletal muscle - CORRECT ANSWER - Which of these capillary beds has the most
variable blood flow?
Na+ leak channels and fast voltage-gated Ca+ channels - CORRECT ANSWER - The
pacemaker cardiac muscle cells rely on ______________ for their action potentials.
B and C only
voltage-gated Na+ channels
voltage-gated Ca+2 channels - CORRECT ANSWER - Which of the following channels
are involved in the action potential in contractile cells of the heart?
after depolarization before repolarization - CORRECT ANSWER - Click on the region of
the graph that represents opening slow voltage-gated Ca+2 channels.
A and B
increased venous return
ACTUAL Questions and CORRECT
Answers
myosin - CORRECT ANSWER - Identify the contractile protein represented in orange.
the length of the A-bands - CORRECT ANSWER - During sarcomere contraction, which
of the following does NOT change length?
troponin; tropomysin; actin - CORRECT ANSWER - During sarcomere contraction, Ca
binds to ______________ , which allows ______________to move and reveal the
______________ active sites for crossbridge formation.
1, 3, 5, 2, 4 - CORRECT ANSWER - Place the following steps of crossbrige formation in
the correct order:
1. AP reaches T-tubules
2. Tropomyosin moves to reveal active sites
3. Ca is released from the SR
4. Crossbridge forms
5. Ca binds to troponin
Latent period (orange) - CORRECT ANSWER - Click on the region of the graph in which
Ca is being released from the sarcoplasmic reticulum.
Summation - CORRECT ANSWER - This graph represents ______________ in a skeletal
muscle fiber.
poliomyelitis - CORRECT ANSWER - Choose the disorder that causes a destruction of
somatic motor neurons.
, B and D are correct
More capillaries
more myoglobin - CORRECT ANSWER - Aerobic, or low-intensity, muscle training
eventually results in
fast-glycolytic - CORRECT ANSWER - A bodybuilder's upper body would contain
extremely well-trained ______________ fibers.
veins - CORRECT ANSWER - In systemic circulation, which type of vessel has the lowest
pressure?
dilation - CORRECT ANSWER - Low O, high CO, or low pH, when detected in a
SPECIFIC CAPILLARY BED, will cause paracrine agents to be released causing
______________ in local arterioles feeding that capillary bed.
skeletal muscle - CORRECT ANSWER - Which of these capillary beds has the most
variable blood flow?
Na+ leak channels and fast voltage-gated Ca+ channels - CORRECT ANSWER - The
pacemaker cardiac muscle cells rely on ______________ for their action potentials.
B and C only
voltage-gated Na+ channels
voltage-gated Ca+2 channels - CORRECT ANSWER - Which of the following channels
are involved in the action potential in contractile cells of the heart?
after depolarization before repolarization - CORRECT ANSWER - Click on the region of
the graph that represents opening slow voltage-gated Ca+2 channels.
A and B
increased venous return
