You know, I'm not entirely sure? I work as a baker, not a biologist. I did go to college, but it's been a while since I had to pass any science courses.
I think I remember something about our hearts being differently-shaped than your average mammal- and located rather lower down- so there's more room for things to go through the ribcage area. If that helps at all.
I went to a wikipedia page on spiders and made vague headcanon guesses
[Muffet considers the question thoughtfully.]
You know, I'm not entirely sure? I work as a baker, not a biologist. I did go to college, but it's been a while since I had to pass any science courses.
I think I remember something about our hearts being differently-shaped than your average mammal- and located rather lower down- so there's more room for things to go through the ribcage area. If that helps at all.