Which one of the following air pollutants combines with the haemoglobin of human blood and reduces its oxygen-carrying capacity, leading to suffocation and may cause even death?

Which one of the following radio elements is used to measure the speed of the blood flow in the human body?

In the human body, blood flows through a process of double circulation. Which one of the following statements is true in this regard ?

Which one of the following statements best describes the role of B cells and T cells in the human body?

Which one of the following salts is found in maximum amount in the human bones?

Which one of the following proteins is present in human hair and nails?