Question

why do humans grow against the gravity?​

Answer 1

Answer:

Human muscles adapt to new situations. When we need our muscles, we can activate them almost immediately. ... Thus, in microgravity, tension is reduced on muscles that support the body against gravity, resulting in a loss of muscle mass and an accompanying loss of muscle strength.

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Answer 2

Answer:

In stronger gravitational fields the size of cells decreases, and in weaker gravitational fields the size of the cell increases.

Gravity is thus a limiting factor in growth of individual cells.