Jawapan

2016-08-18T17:06:32+08:00
Blood will go backwards
besides that, can you explain about the oxygenated blood and deoxy may min together and effect?
mix*
if the oxygenated blood and deoxy mix together , concentration of oxygen decrease . the heart will pump faster because of not enough oxygen in the body
thank you!
no problem
2016-08-19T09:06:26+08:00