In the vertebrate blood, the carrier of oxygen to the tissues or respiratory pigment is
A
Plasma
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B
Lymphocytes
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C
Leucocytes
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D
Haemoglobin
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Solution
The correct option is D Haemoglobin Hemoglobin is the iron-containing oxygen-transport protein in the red blood cells of all vertebrates (with the exception of the fish family Channichthyidae) as well as the tissues of some invertebrates. Hemoglobin in the blood carries oxygen from the respiratory organs (lungs or gills) to the rest of the body (i.e., the tissues). There it releases the oxygen to permit aerobic respiration to provide energy to power the functions of the organism in the process called as metabolism.