pulmonary arteries oxygen-poor blood direction

The arteries going to your lungs carry oxygen-poor blood

Arteries and veins are named for which direction blood moves, not for how much oxygen it contains. The arteries to the lungs carry oxygen-poor blood away from the heart, while veins bring oxygen-rich blood back from the lungs.

A rainy winter can turn the Dead Sea red

In 1980, a rainy winter lowered the Dead Sea’s salt level. Algae called Dunaliella nourished red-pigmented bacteria, and the brief microbial bloom turned the usually dark-blue water red.

Damselfish protect shrimp that fertilize their algae

Longfin damselfish guard patches of algae on coral reefs. They allow small mysid shrimp to live there because the shrimp's waste fertilizes the algae. The fish get better-growing food, while the shrimp get protection from predators.

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pulmonary arteries oxygen-poor blood direction

The arteries going to your lungs carry oxygen-poor blood

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