Human Immunity and Blood

Erythrocyte or red blood cells are involved in gaseous transport. 

In proximal end of tibia, humerus and flat bones, red blood cells are formed after 5 years of age.

This is the right answer.

White blood cells are mobile units of the body protective system. 

Erythrocytes are red blood cells.

Nerve cells do not produce white blood cells. 

 They are  of white blood cells and produced during lymphopoiesis.

With regard to transfusions of packed red blood cells, individuals with type O Rh D negative blood are often called universal donors and those with type AB Rh D positive blood are called universal recipients

This is the correct option. Plasma is the colourless fluid part of blood, lymph, or milk, in which corpuscles or fat globules are suspended.

This is the correct option. Erythrocyte is another name for RBCs.

Mature RBC lacks nucleus and its life span is 120 days.

WBC (White Blood Cells) is correct because white blood cells are the primary component of the immune system that fights infections and diseases. RBCs carry oxygen, platelets help with blood clotting, and plasma is the liquid medium that carries the cells.

Plasma is correct because plasma is the liquid portion of blood (about 55% of blood volume) that carries blood cells, nutrients, hormones, and waste products. RBCs and WBCs are cells, not liquid. Water alone is not the transport medium in blood.

Lymphocytes (specifically B-lymphocytes) are white blood cells responsible for producing antibodies as part of the adaptive immune response. When they detect foreign antigens, they differentiate into plasma cells that mass-produce specific antibodies to neutralize pathogens. Leucocytes is the general term for all white blood cells; phagocytes engulf pathogens; erythrocytes are red blood cells.