[removed]

But you don't have hollow bones to pump stale air into, except in your nose.

[deleted]

So, if you measured a giraffe's BP at the head (while standing tall) would it be similar to a human's? And do they suffer a major headrush when going from ground grazing to treetops?

[removed]

All of this is in reference to the actual size of giraffe lungs. No human comparison is made. Felt like I should clarify

[removed]

[removed]

[removed]

I learned how to circular breathe when I was in band. I once played the same note on my French horn for 5 straight minutes without stopping

[removed]

[removed]

[removed]

We are talking about 500 bpm. That's like 8 per second. In a huge heart.

I can't see how a big heart like that could pump enough blood to not faint immediately even for a human, let alone an animal several times bigger, and then, if it doesn't get pretty fast back to normal result in death.

I know the fibrillation part is an exageration, but sill, 500bpm?

Do you thing a human, let alone a bigger animal wouldn't instantly faint?

Edit: You can't compare a dog that is maybe 35-50 kg to a grown man who is 80 and then use this to talk about giraffes as you can't compare blood presure extremes to heart rate extremes.

Reason for the genetic differences between humans and Neanderthals is that the two populations were separated for a long period of time, and evolved independently. Humans and Neanderthals likely diverged from a common ancestor around 600,000 years ago, and lived in separate geographic regions for hundreds of thousands of years.

​

During this time, the two populations were exposed to different selective pressures, which led to the evolution of distinct physical and behavioral adaptations.Another reason for the genetic differences between humans and Neanderthals is that there was some interbreeding between the two populations. Studies of the Neanderthal genome have revealed that modern humans of non-African descent carry about 2-4% of Neanderthal DNA in their genome, indicating that there was some interbreeding between the two populations when modern humans first began to migrate out of Africa.

​

Comparing two human individuals, the genetic differences would be much smaller. The human genome is about 99.9% identical from person to person, with the remaining 0.1% accounting for genetic variation that is responsible for differences in physical characteristics, such as eye and hair color, as well as differences in susceptibility to certain diseases.

Dinosaurs (including birds) have a circular breathing system that makes it possible to have even more extreme necks.

Yes its called Artic Greening and is happening quickly.

Other factors such as permafrost thawing, changes in fire regimes, and land use changes are also affecting the treeline. Additionally, this process is not uniform and varies in different regions, some areas may even experience a shrinkage of treeline.

It's important to note that this process is not only affecting the treeline but also the entire ecosystem in the Arctic, as the trees support many other species and changes in the treeline can have cascading effects on the entire ecosystem.

I am actually a CVT and am responsible for monitoring ICU patients on ECGs regularly and very familiar with basic cardiology. A high HR does not on its own equal Vfib. (I have seen SVT in large dogs well into the 300s many times, for example.) Also, giraffes are unique in many ways and cannot be compared to humans. A BP of 220/180 would also not be sustainable long term for a human but that is normal for them in order to allow a more typical pressure by the time it gets all the way up to their brain.

Ice crystals refract light by ~22 deg. There are ice crystals everywere doing this. But you only see the ones that refract light towards you, which are the ones ~22 deg away from the Moon from your vantage point.

[removed]

A big heart has to have the time to fill up with blood to pump it. So, you have to have bigger arteries and higher blood pressure that can help with that, but raising the heart beat is only effective to a point were it starts to be to fast for the heart to expand. It is the reason why in humans aerobic exercise is advised to be up to 140 bpm (of course there are no absolute limits) since if you go higher the faster heart beat doesn't help circulate more blood.

So, a huge animal with a huge heart is very unlikely to have such a crazy heartbeat.That would be considered ventricular fibrillation and said huge animal would probably drop dead in a second.

[removed]

[removed]

[removed]

Imagine breathing through a 50-foot garden hose.

You breathe in, you might take in all the air in the hose.

You breathe out, you put that same air back into the hose.

Breathe in again, and you get the same air you breathed out but now it doesn't have much oxygen left.

By the third breath, your lungs have removed all the oxygen out of the air in the hose. The volume of air in the hose is considered "dead air" (tidal volume).