Question

The most abundant transition metal in human body is:
A. Copper
B. Iron
C. Zinc
D. Manganese

Answer 1

Hint: Iron is an element which functions as a carrier of oxygen to different cells and tissues.

Complete step by step solution:
Elements having partially filled d subshell are called transition elements. This included d block elements. It has a general electronic configuration as [inert gas]$\left( {{\text{n}} - 1} \right){{\text{d}}^{\left( {1 - 10} \right)}}{\text{n}}{{\text{s}}^{\left( {0 - 2} \right)}}$.
Transition metals show different kinds of properties. This is because the d orbital is partially filled. The properties may include formation of color compounds, formation of compounds having varied oxidation states, formation of paramagnetic compounds. There are several transition elements in the human body. For example, iron, zinc, cobalt, copper, zinc, chromium, manganese, molybdenum.
 Iron covers of human body weight. Others are lesser than that. Cobalt is involved in vitamin B-12. It has a major role in DNA regulation and protein formation. Iron cannot function without copper. It produces energy from carbohydrates, proteins and fats. Similar to iron, copper is also used in red blood cells. Zinc is responsible mainly for blood clotting, our taste and smell. Iron plays a major role in RBCs in carrying oxygen cells and tissues. Fighting against diseases is also a major role of iron. Iron combined with a protein is called hemoglobin which is present in RBCs. Since it transfers oxygen to cells and tissues, it needs to be more in amount. Thus it is abundant.

Hence the option B is correct.

Additional information:
Transition elements help to reduce the harmful reactive oxygen species. Most of the transitional elements are used in enzymes. Also they are essential for growth and to increase immunity.

Note: While we breathe, oxygen present in our lungs combines with the iron in hemoglobin and forms oxyhaemoglobin which further on transports all around the body by RBCs. This oxygen helps to convert sugars to energy with the help of iron