Human Immunity and Blood

Complete Blood Count (CBC) shows damaged red blood cells and indicates mild anemia. CBC is a blood test that measures various components including red blood cells, white blood cells, hemoglobin, and platelets. Hypersensitivity and autoimmune reactions are conditions, not CBC findings.

People with blood group O (especially O negative) are called universal donors because their red blood cells lack A and B antigens, allowing transfusion to any blood type.

AB positive blood type individuals are universal recipients because they have both A and B antigens and no anti-A or anti-B antibodies. This allows them to receive blood from any ABO group without adverse reactions.

Leukemia is a cancer of blood-forming tissues, primarily the bone marrow and lymphatic system. It causes the production of abnormal white blood cells that crowd out healthy blood cells, leading to infections, anemia, and bleeding problems.

Leukemia is the medical term for cancer of the blood-forming tissues, including the bone marrow and lymphatic system. It involves the overproduction of abnormal white blood cells.

Blood cells (RBCs, WBCs, and platelets) are suspended in plasma, which is the liquid component of blood. Plasma makes up about 55% of blood volume and carries cells, nutrients, hormones, and waste products throughout the body.

Blood gets its red color from haemoglobin, a protein containing iron that binds to oxygen in red blood cells. Haemoglobin turns bright red when oxygenated and darker red when deoxygenated. Plasma is actually yellowish, platelets are cell fragments for clotting, and capillaries are tiny blood vessels.

White blood cells (leukocytes) are the key components of the immune system that fight infections and diseases. They attack bacteria, viruses, and other pathogens. Red blood cells carry oxygen, platelets help with clotting, so white blood cells are the correct answer for disease fighting.

Human blood is classified into four main groups based on the ABO system: A, B, AB, and O. Each group can be Rh-positive or Rh-negative, creating eight total types, but the fundamental classification is four groups. This is the most basic blood typing system used worldwide.

Blood group O negative is called the Universal Donor because it lacks A and B antigens and the Rh factor. This means it can be given to almost anyone without causing an immune reaction. Type AB positive is the universal recipient, while A and B can only donate to certain types.

Leukemia is a cancer of the body's blood-forming tissues, including the bone marrow and the lymphatic system. It primarily affects the white blood cells, causing them to grow abnormally and crowd out healthy blood cells. It is not a disease of the lungs, skin, or nerves.

Blood cells (red blood cells, white blood cells, and platelets) are suspended in plasma, the yellowish liquid component of blood. Plasma makes up about 55% of total blood volume and consists mainly of water with proteins, electrolytes, nutrients, and waste products dissolved in it.

Blood gets its characteristic red color from hemoglobin, an iron-containing protein found in red blood cells. When hemoglobin binds with oxygen, it turns bright red; when it releases oxygen, it becomes darker red. Plasma itself is actually a pale yellow color.

White blood cells (leukocytes) are the immune system's primary defense cells. They identify and destroy pathogens like bacteria and viruses through phagocytosis and antibody production. Red blood cells transport oxygen, while platelets help with clotting.

Human blood is classified into four main groups based on the ABO system: Type A, Type B, Type AB, and Type O. Each group is determined by the presence or absence of specific antigens on red blood cells. This is a fundamental concept in blood transfusion medicine.