Recent comments in /f/askscience

Jackalodeath t1_j4452r8 wrote

Reply to comment by Chagrinnish in How do giraffes breathe? by NimishApte

Mass and volume scale a bit differently when it comes to biology.

For example, average blue whale weighs about 310,000lbs, easily weighing over 2,000 times as much as an average (about 154lbs) person.

Yet Blue Whale lung capacity can reach 5,000 litres, while average Joe sits around 6 litres. A whale "only" has a bit over 800 times the volume.

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Sharlinator t1_j4422kh wrote

Reply to comment by Kittelsen in How do giraffes breathe? by NimishApte

The avian respiratory system is very different from the mammalian system. Bird lungs don't expand and contract like mammals' do; rather birds have several air sacs that expand and contract in an alternating fashion and push air unidirectionally through the lungs; the lungs have millions of narrow "tubes" where gas exchange occurs, whereas the alveoli in mammalian lungs are "bags" with only one opening.

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froggo921 t1_j440rl7 wrote

Reply to comment by Hagenaar in How do giraffes breathe? by NimishApte

Apparently, a giraffes BP is 280/180mmHg

Regarding the headrush, they don't

Edit:

Giraffe's have basically a vascular sponge in their brain, which dampens BP spikes when moving the head. Also, their arteries have valves as well.

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EngineeringFetish t1_j43wwvy wrote

Reply to comment by 420LongDong69 in Since the world is getting warmer, is the arctic treeline being pushed back? by JanniesStopBanningMe

>book by Ben Rawlence called The Treeline that talks about climate change and the Arctic Treeline

It was from him, I trust the source as he's quite dedicated to the topic of climate change and environmental preservation

But there's no widely acceptable study for this other than Ben Rawlence

​

And all the facts on The Arctic heating up and the effects of climate change in the are a seems to match up with the claim.

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