The breakdown product of haemoglobin is

Which of the following statements are wrong?
$(i)$ Leucocytes disintegrate in the spleen and liver.
$(ii)$ $RBC$,$WBC$ and blood platelets are produced by bone marrow.
$(iii)$ Neutrophils bring about destruction and detoxification of toxins of protein origin.
$(iv)$ The important function of lymphocytes is to produce antibodies.

What is the function of the spleen in humans?

Which of the following flowcharts correctly represents the process of blood clotting?

The process of blood clot formation within the circulatory system is known as:

The given figure shows a schematic plan of blood circulation in humans with labels $A$ to $D$. Identify the label and give its functions.