Sentences with phrase «when essential organs»

Not exact matches

The fishes» oxygen release system became even more efficient over the ensuing 150 - 270 million years, when it was necessary to deliver large amounts to organs such as the eye — which requires very large O2 loads to function well and avoid vision cell death — and which was essential to seeing clearly under water, to hunt or avoid predators.

When the «fight - or - flight» system gets activated, it keeps only the essential parts of your body running, like muscles tensing up, heart rate increasing, breathing getting faster and the slows down of your digestive system (you don't need to eat if you're running away), immune system and your reproductive organs.