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Ch. 10 Muscle Tissue and Physiology

Chapter 10, Problem 10.3a

Ms. Sanchez was in a motorcycle accident in which she lost the use of her right upper limb muscles due to significant nerve damage. However, when an electrode is inserted into her muscles, they are able to contract. Explain specifically why nerve damage caused her to lose the use of her muscles. Why can they still respond to stimulation from an electrode?

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Hey, everyone. Let's take a look at this question together. Pastor Jeff had a stroke during a sermon. But luckily he was rushed to the hospital and he survived. Pastor Jeff became paralyzed on the whole right side of his body. Explain why the right side of his body lost muscles. Is it due to answer choice? A dehydration. Answer choice. B Kia answer choice. C neurogenic atrophy or answer choice. D malnutrition. Let's work this problem out together to try to figure out which of the following answer choices explains why Pastor Jeff lost muscles on the right side of his body. So from the question, we know that Pastor Jeff had a stroke which led to him becoming paralyzed on the entire right side of his body. And we know that the muscle contraction of the right side of his body is triggered by the nerves. And since the right side of his body lost muscles, those lost muscles can be the result of nerve damage. And since we know that he had a stroke and then became paralyzed, an injury or disease that affects the nerves which connect to the muscles. In this case, the nerves that connect to the muscles on the right side of his body resulted in neurogenic atrophy which its answer choice. C the correct answer since neurogenic atrophy is caused by an injury or disease that affects the nerves which connect to the muscles. And in this case, the nerves that connect to the muscles on the right side of Pastor Jeff's body resulted in nerve damage. So answer choice C is the only correct answer choice. I hope you found this video to be helpful. Thank you and goodbye.
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How does a skeletal muscle fiber differ structurally from typical cells?

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Mark the following statements as true for smooth muscle tissue, cardiac muscle tissue, and/or skeletal muscle tissue.          


a. ____Actin attaches to dense bodies.          ​​​​

b. ____Cells are joined by intercalated discs.          ​​​​

c. ____The thick and thin filaments are arranged into sarcomeres.          ​​​​

d. ____The thick filaments contain myosin heads along their entire length.          ​​​​

e. ____The cells depolarize and contract as a unit.          ​​​​

f. ____ Ca2+ binding to troponin is the initiating event of contraction.          ​​​​

g. ____Ca2+ binding to calmodulin is the initiating event of contraction.          ​​​​

h. ____The sarcolemma has a distinct motor end plate.

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Match the following terms with the correct definition.      


____Z-disc     

____Sarcomere     

____A band     

____H zone     

____I band     

____M line


a. The dark band containing the entire length of the thick filament

b. The band of proteins in the middle of the H zone

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d. The functional unit of contraction

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f. The light band containing only thin filaments

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What is the basic mechanism of contraction at the level of myofilaments?

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