When blood returns to the heart, it follows a complicated pathway. If you were in the bloodstream, you would follow the steps below one by one. Oxygen-poor blood (shown in blue) flows from the ...

Human blood is red because hemoglobin, which is carried in the blood and functions to transport oxygen, is iron-rich and red in color. Octopuses and horseshoe crabs have blue blood. This is ...

Mammals, from the mighty blue whale to the ... and function of the heart across mammals was the same. But research from my colleagues and I reveals that the human heart is an outlier, distinctly ...

The physiological mechanisms that underpin human colour vision have ... on heart rate and blood pressure: red light does seem to raise heart rate, while blue light lowers it.

Scientists have found a way to use spinach to build working human heart ... red dye could be pumped through its veins, simulating the blood, oxygen and nutrients human heart tissue needs to ...

When blood returns to the heart, it follows a complicated pathway. If you were in the bloodstream, you would follow the steps below one by one. Oxygen-poor blood (shown in blue) flows from the ...