c09 Practice Quiz
On this quiz, score 80% or higher, and receive a +5 bonus on the test.
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1. Oxygen starved tissues can release chemical signals into the blood that can change the diameter of nearby blood vessels delivering oxygen and nutrients to the tissues. In doing so the blood vessels will respond through vasodilation (widening of the vessel). Which muscle type is responsible for this vasodilation? *
1 point
2. Rigor mortis occurs because ________. *
1 point
3. If a muscle fiber were to suddenly and permanently stop producing ATP the fiber would no longer be able to actively transport calcium out of the cytoplasm (sarcoplasm) and the intracellular calcium concentration would rise. Which of the following would you expect to happen? *
1 point
4. Of the following muscle types, which has only one nucleus, no sarcomeres, and few gap junctions? *
1 point
5. Curare is a poisonous plant extract. Curare molecules have a chemical structure like the neurotransmitter ACh. Curare can bind to the ACh receptor site on the chemically gated ion channels in the motor end plate. Even though curare will bind to the receptor site it will not open the ion channel and no ions will pass through. What do you think the symptoms of curare poisoning would look like? *
1 point
6. A myosin molecule in the thick filaments can be considered a protein having a quaternary structural level. Which of the following best describes this structural level? *
1 point
7. What is the role of tropomyosin in skeletal muscles? *
1 point
8. Although all the anatomical parts of muscle work together to give it it's characteristics, which of the following proteins listed below would be most associated with the characteristics of excitability? *
1 point
9. What is the functional role of the T tubules? *
1 point
10. Which of the following statements best illustrates the fact that skeletal muscle is voluntary muscle? *
1 point
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