Figure shows schematic plan of blood circulation in humans with labels A to D, Identify the label and given its function`//`s

Adult human RBCs are enucleate. Which of the following statement (s) is/are most appropriate explanation for this feature ?
(1) They do not need to reproduce
(2) They are somatic cells
(3) They do not metabolise
(4) All their internal space is available for oxygen transport.

Which one of the following blood vessels in mammals would normally carry the largest amount of urea

Name the blood cells, whose reduction in number can cause clotting disorder, leading to excessive loss of blood from the body.

Arteries are best defined as the vessels which

Blood pressure in the pulmonary artery is

Serum differs from blood in

Which one of the following animals has two separate circulatory pathways

Which one of the following statements is correct regarding blood pressure ?

Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when