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Which of the following hormones can play a significant role in osteoporosis?

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Important Questions on Locomotion and Movement

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Calcium important in skeletal muscle contraction because 
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The pivot joint between atlas and axis is a type of
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Out of 'X' pairs of ribs in humans, only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation:
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Name the ion responsible for the unmasking of active sites for myosin for cross-bridge activity during muscle contraction.
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Osteoporosis, an age-related disease of the skeletal system, may occur due to
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Sliding filament theory can be best explained as:
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Which of the following joints would allow no movement?