Name: 滲透 - 魚是如何喝水的？| 滲透--魚是如何喝水的？ (Osmosis - How do fish drink water? | #aumsum)
Uploaded: 2021-01-14T08:11:30.000Z
Duration: 1 min 35 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

Fish take in water usually through their mouth or gills.

Depending on whether they live in freshwater or saltwater.

Freshwater fish takes in water mainly through its gills.

Because it has less water and more salt concentration in its blood than the surrounding water.

Hence, due to osmosis, water from the surrounding flows through the gills into its bloodstream.

However, as the fish is continuously taking in water, it urinates a lot and removes excess water.

Saltwater fish takes in water through its mouth.

This is because its blood has more water and less salt concentration than the saltwater around it.

Hence, to maintain the balance, the fish gulps saltwater through its mouth.

Filters the water for its use and expels excess salt while urinating.

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