Why do long periods of sitting or standing cause our legs and ankles to swell?

What will be an ideal response?


Blood flow in the veins depends partly on our voluntary motions. When we move, our muscle contractions squeeze blood along the veins. Without this motion, blood collects in our lower extremities such as the legs and ankles.

Environmental & Atmospheric Sciences

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Indicate whether the statement is true or false.

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The birth rates in most Central Asian states are in the 20s per 1,000 population

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Over 10% of the world's population is actively engaged in urban agriculture

Indicate whether this statement is true or false

Environmental & Atmospheric Sciences

At Hakalau Forest in ________, ranchland is being restored to forest, invasive plants are being removed and native ones are being planted, and néné are being protected while new populations of them are being established

A) Marshall Islands B) Tuvalu C) Hawaii D) Guam E) Japan

Environmental & Atmospheric Sciences