Human Immunity and Blood

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.

Platelets (thrombocytes) are cell fragments essential for blood clotting (coagulation). When a blood vessel is damaged, platelets adhere to the site, release chemical signals to recruit more platelets, and provide surface for clotting factors to form fibrin mesh that traps blood cells to stop bleeding. RBCs carry oxygen; WBCs fight infection; plasma is the liquid medium.

Hemoglobin is the red pigment found in red blood cells that gives blood its characteristic red color. It contains iron and binds to oxygen, allowing red blood cells to transport oxygen throughout the body. Plasma is the liquid portion of blood, platelets help with clotting, and carbon dioxide is a waste product transported by blood.

Phagocytes and lymphocytes are both types of white blood cells (leukocytes) that play crucial roles in the immune system. Phagocytes engulf and digest pathogens, while lymphocytes (including B and T cells) target specific threats. Red blood cells carry oxygen, platelets aid clotting, and plasma is the liquid portion.

Leucocytes (or leukocytes) is the scientific term for white blood cells, which are responsible for fighting infections in the body. While phagocytes are a specific type of white blood cell that engulf pathogens, leucocytes is the broader category. Erythrocytes are red blood cells, melanocytes produce skin pigment.

All of the above

Cells of liver which act as phagocytes are Kupffer cells.