Question

where red blood cells are killed in human body

Answer 1

Hemoglobin is the protein inside red blood cells that carries oxygen. Red blood cells also remove carbon dioxide from your body, transporting it to the lungs for you to exhale. Red blood cells are made inside your bones, in the bone marrow. They typically live for about 120 days, and then they die.

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Answer 2

Red blood cells are not killed just they do not have nucleus,nucleus are removed for performing their function to carry oxygen.
But if we talk about dead then their life span is about 120 days.
SPLEEN is the abodominal oragan which is include in 3 main functions and one of them is that this orangan removes RBCs means they remove died red blood cells.

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