Galen’s theories about the heart and the circulation of the blood were likewise overturned in time.* English physician William Harvey spent years dissecting animals and birds.
Nadharia za Galen kuhusu moyo na mzunguko wa damu pia zilipinduliwa baada ya muda.* Daktari Mwingereza William Harvey alitumia miaka mingi kuwapasua wanyama na ndege.