Acute exposure to high altitude can affect the cardiovascular system by decreasing oxygen in the blood (acute hypoxia). It also increases demand on the heart, adrenaline release and pulmonary artery pressures.
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Answer:
Our limbs, such as our arms and legs, grow basically at the same time and to the same length. ... Scientists are still unsure of how exactly human arms, legs, ears, or lungs grow in such a symmetrical way.
Bones and the skeletal system they make up serve to provide the body support and protection of the vital organs