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Question 2 You would expect to find lower myoglobin levels in oxidative muscle fibers than in glycolytic muscle fibers. True False Question 5 Each...

Question 2

You would expect to find lower myoglobin levels in oxidative muscle fibers than in glycolytic muscle fibers.

True

False

Question 5

Each skeletal muscle cell constitutes a single

a.sarcomere.

b.motor unit.

c.muscle fiber.

d.sarcolemma.

e.myofibril.


Question 6

When experimentally applying curare to a muscle, you find that it does not contract when the motor neuron leading to it is electrically stimulated. If you knew that this toxin blocks acetylcholine receptors, what can you conclude about the failure to contract?

a.A contraction fails to occur because this toxin directly prevents calcium ion release from intracellular stores.

b.A contraction fails to occur because an action potential is not generated in the muscle cell.

c.A contraction fails to occur because neurotransmitter release by the motor neuron is blocked at the neuromuscular junction.

d.A contraction fails to occur because acetylcholine is not released from the motor neuron.

e.A contraction fails to occur because this toxin prevents cross-bridge formation and thereby directly prevents contraction.



Question 9

You would expect to find more mitochondria in glycolytic fibers than in oxidative fibers?

True

False


Question 12

A group of vertebrates that do not have bone are the?

a.reptiles.

b.sharks.

c.amphibians.

d.ray-finned fishes.


Question 14

What is the correct sequence of events in cross-bridge cycling?

a.Myosin cross-bridge binds to actin, the powerstroke moves the thin filament relative to the thick filament, ATP binds to myosin and cross-bridge detachment occurs, ATP is hydrolyzed and the myosin head is "cocked"

b.Myosin cross-bridge binds to actin, ATP binds to myosin and cross-bridge detachment occurs, the powerstroke moves the thin filament relative to the thick filament, ATP is hydrolyzed and the myosin head is "cocked"

c.Myosin cross-bridge binds to actin, ATP is hydrolyzed and the myosin head is "cocked," the powerstroke moves the thin filament relative to the thick filament, ATP binds to myosin and cross-bridge detachment occurs

d.The powerstroke moves the thin filament relative to the thick filament, myosin cross-bridge binds to actin, ATP binds to myosin and cross-bridge detachment occurs, ATP is hydrolyzed and the myosin head is "cocked"

e.These events can occur in any sequence without affecting muscle function.

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