The synthesis of Vitamin D decreases with age. This is <span>due because of a fall in 7-dehydrocholesterol levels.</span>
Blood in the pulmonary vein is oxygen rich, while in all of the other veins, it is oxygen poor.
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True
In the standard pushup, the following muscles are targeted:
chest muscles, or pectorals.
shoulders, or deltoids.
back of your arms, or triceps.
abdominals.
the “wing” muscles directly under your armpit, called the serratus anterior.
