Which of the following likely contributes to muscle loss during space flight? (select all that are correct, even if it is only one answer):Each correct answer will score partial points, each incorrect answer will score an equivalent deductionGroup of answer choicesDecrease in protein synthesis in microgravityDecrease in myoblast activity in microgravityDecrease reactive force resulting in lower contractile force required in microgravityDecrease in osteocyte activity in microgravity
Question
Which of the following likely contributes to muscle loss during space flight? (select all that are correct, even if it is only one answer):Each correct answer will score partial points, each incorrect answer will score an equivalent deductionGroup of answer choicesDecrease in protein synthesis in microgravityDecrease in myoblast activity in microgravityDecrease reactive force resulting in lower contractile force required in microgravityDecrease in osteocyte activity in microgravity
Solution
The factors that likely contribute to muscle loss during space flight are:
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Decrease in protein synthesis in microgravity: In microgravity, the body doesn't need to work as hard to move or stay upright, which can lead to muscle atrophy. This is because the synthesis of proteins, which are the building blocks of muscle tissue, is reduced.
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Decrease in myoblast activity in microgravity: Myoblasts are cells that contribute to muscle growth and repair. In microgravity, their activity is decreased, which can contribute to muscle loss.
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Decrease reactive force resulting in lower contractile force required in microgravity: In microgravity, the muscles don't need to contract as forcefully to move the body. This decrease in contractile force can lead to muscle atrophy.
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Decrease in osteocyte activity in microgravity: While osteocytes are primarily involved in bone remodeling, they also play a role in muscle-bone interaction. A decrease in their activity could potentially contribute to muscle loss, although the connection is less direct than the other factors.
So, all of the options are correct.
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