SECTION - A [CHEMISTY - MCQ]

Question

Which one of the following proteins transports oxygen in the blood stream

Vidyadip · Accepted Answer

d
Hemoglobin is protein pigment of red blood cells, which is remarkably suited for
transport of oxygen. It binds to oxygen under higher alveolar oxygen
concentration and little higher $pH$ and cooler temperature. The product is
oxyemoglobin. Likewise, under lower concentration of oxygen in the tissues and
comparatively lower $pH$ and warmer temperature in the tissues facilitates
release of oxygen from hemoglobin and formation of deoxyhemoglobin $(Hb)$. This
makes option $D$ correct.Myoglobin is the pigment of muscles that serves to
store oxygen but owing to its higher affinity for oxygen than haemoglobin. It
does not release oxygen easily which makes option $A$ incorrect.Insulin is
secreted by islets of Langerhans of pancreas and serves to lower the blood
glucose level by stimulating the uptake of glucose by cells, specifically muscle
cells, liver cells and adipose tissues cells. This makes option $B$
incorrect.Albumins, group of proteins produced by the liver, are present in
human plasma and serve to maintain the osmotic concentration of blood and
thereby maintaining blood volume and blood pressure.

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