If blood going away from the heart is generally oxygen-rich, then what is generally true about blood going away from the heart?

Answer choices:
- The bending of a ray of light
 - it is 99% water
 - A compound that donates proton
 - To another location like underground
 - it is usually low in oxygen
 - it can be seen
 - it has no hemoglobin
 - it is usually oxygen-rich

 

        it is usually oxygen-rich  