"The blood that returns has the oxygen removed from it immediately, so you see the colour of deoxygenated blood, which is blue," explains Abbs.
Abbs ອະທິບາຍວ່າ "ເລືອດທີ່ກັບຄືນມາມີອົກຊີເຈນທີ່ຖືກເອົາອອກຈາກມັນທັນທີ, ສະນັ້ນທ່ານຈະເຫັນສີຂອງເລືອດ deoxygenated, ເຊິ່ງເປັນສີຟ້າ," Abbs ອະທິບາຍ.