Your functions and blood are all moving by the force of gravity, so when everything is raised or lowered(moving your arm), your pulse wave changes. This can also result from subtlty in higher blood pressure, when activity occures. Just as your pulse waves changes in the rest of your body when excersising, you will have a slight change in pulse when simply moved your arm up and down, you're gettin' that blood pumping! ;)
Hope this helps :)
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False because it does the opposite
Answer; Calcitonin: increases blood calcium levels.
Explanation: Calcitonin is a 32 amino acid peptide hormone.
Calcitonin acts to REDUCE blood calcium, opposing the effects of parathyroid hormone.