“A heart is something that just pumps blood, from a neurologist point of view.” – Dr.M
It is the most ridiculous pun I ever heard but it is actually true. When you normally use the poetic expression “heart”, you actually mean the limbic system. That’s where your “love is blind”, “follow your heart” applies. It is the core reason why we fall in and out of love as it processes our emotions (yep the illogical decisions). But yeah it would be weird to say “I love you with all my limbic lobe”.