Blood that leaves the heart is bright red. It travels through arteries and capillaries. When
it reaches the veins on its way back to the heart, it is darker red. Explain why this change
occurs.

Question

Blood that leaves the heart is bright red. It travels through arteries and capillaries. When
it reaches the veins on its way back to the heart, it is darker red. Explain why this change
occurs.

jesselacompte · Answer

help plz I will meadel

emilee02 · Answer

i had this ? yesterday hold on

emilee02 · Answer

cuz it has lower oxygen leval

emilee02 · Answer

the answer is because the oxygen leaves the blood

seanstewart16 · Answer

mmhm, the body takes the oxygen out of the blood and sends it back to heart to get reoxygenated. this is a bio question tho, not earth science

osprey · Answer

blood goes, I think, from the heart to the lungs where it picks up oxygen OXYHAEMOGLOBIN being the long winded term which is one colour. When blood delivers said oxygen to the various bits and piece in the body it becomes de oxygenated and changes colour to blue, maybe. 
above is a bit of a guess.