r/biology

I always hear about animal-to-human transmission of diseases, but I don't think I have ever heard of the opposite: human-to-animal transmission, with clear and concrete examples or explanations of how it happens.

I don't know the exact term for it, so I can't search for it on my own. I tried and what I searched came up as 'zoonosis'. But that's from animals to humans, i want to know the term for the exact opposite.

Got this weird shower though while feeding my cat my leftovers, since the talk of animal to human transmission is so common.

Malaria, dengue,COVID etc.

Let's say that I saw a blue whale today for the first time ever. And so new memory was made.

What causes neurons to form new pathways? How does "looking at a blue whale" becomes a neural pathway? How do neurons get signal from eyes to make new pathways? Is the image sent among neurons? If yes, does that mean that neurons "get a hold of" a memory temporarily?

I'm genuinely curious as to what causes some people to sweat blood. I'd assume it has something to do with an issue regarding dilated blood vessels, but what actually causes it and how does it happen?