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scZoUnD [109]
3 years ago
5

Why is the blood that flows from the lungs toward the heart a brighter red than the blood that flows the other direction?

Biology
2 answers:
tatiyna3 years ago
3 0
There is more oxygen near the lungs, because fresh oxygen goes into the lungs.
zlopas [31]3 years ago
3 0
B. the presence of oxygen-bound hemoglobin makes it bright red
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Explanation:

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In an atom, number of electrons is equal to the number of protons.  And the number of neutrons is equal to the difference between the mass number of the atom and the atomic number. For Nitrogen 14, electron is 7, proton is also 7 as number  of electrons and number of protons are equal. So, the neutron will be 14-7= 7. For Nitrogen 15, electron number is 7 so proton number will be also 7. Neutron number for nitrogen 15 will be 15-7= 8. That's why the answer is option number 4.

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