blood
19 questions tagged blood — spanning every one of the seven Ws.
What is anemia?
Anemia is a condition in which the blood lacks enough healthy red blood cells or hemoglobin to carry adequate oxygen to the body.
What is hemoglobin?
Hemoglobin is the iron-containing protein in red blood cells that carries oxygen from the lungs to the body and gives blood its red colour.
Why do blood types matter in transfusions?
Blood types matter because the immune system can attack red blood cells with unfamiliar surface markers. Matching ABO and Rh types helps prevent dangerous reactions.
What is the bone marrow?
Bone marrow is soft tissue inside bones that makes blood cells. It produces red blood cells, white blood cells, and platelets.
What is the ABO blood group system?
The ABO blood group system classifies blood by A and B antigens on red blood cells. The main groups are A, B, AB, and O.
What is the Rh factor?
The Rh factor is a blood group marker, most famously the D antigen, found on red blood cells. People are often described as Rh-positive or Rh-negative.
When was the human blood group system discovered?
Karl Landsteiner discovered the ABO blood group system in 1900 and 1901.
When was the ABO blood group system discovered?
The ABO blood group system was discovered in 1900 and 1901. Karl Landsteiner identified the blood types that made safe transfusions possible.
Where is hemoglobin found in the human body?
Hemoglobin is found inside red blood cells in the bloodstream. It is the protein that carries oxygen from the lungs to tissues.
Where is the ABO blood group gene located?
The ABO blood group gene is located on chromosome 9 in humans. It helps determine whether a person has A, B, AB, or O blood type.
Which human bone marrow is most important for producing red blood cells in adults?
Red bone marrow is the main site of red blood cell production in adults. It is concentrated in bones such as the pelvis, ribs, sternum, vertebrae, and skull.
Which human blood cell type is the most abundant?
Red blood cells are the most abundant blood cells in humans. An adult has about 20 to 30 trillion of them circulating at any time.
Which human blood component is richest in iron?
Hemoglobin in red blood cells contains most of the body’s iron. Iron is essential because it lets hemoglobin bind and transport oxygen.
How do red blood cells carry oxygen through the body?
Red blood cells use hemoglobin, a protein that binds oxygen in the lungs and releases it in tissues. A healthy adult has about 20–30 trillion red blood cells.
What are platelets?
Platelets are tiny cell fragments that help blood clot after injury. They gather at damaged blood vessels to help stop bleeding.
When was the first description of red blood cells made?
Red blood cells were observed in the 17th century, after the microscope was invented, with Marcello Malpighi among the pioneers.
Where are red blood cells produced?
Red blood cells are produced in the red bone marrow. In adults, this is mainly found in bones such as the pelvis, sternum, ribs, and vertebrae.
Where are hemoglobin genes located in humans?
Hemoglobin genes are found in clusters on chromosomes 11 and 16. They code for the proteins that carry oxygen in red blood cells.
Which human bone marrow is most important for producing blood cells?
Red bone marrow is the main site of blood cell production. In adults, it is found mainly in flat bones and the ends of long bones.