Final answer:
People with type A blood have anti-B antibodies and those with type B blood have anti-A antibodies. Type AB individuals have no anti-A or anti-B antibodies, while type O individuals have both. This knowledge is essential for safe blood transfusions and is a fundamental aspect of human ABO blood group system.
Step-by-step explanation:
It is true that people with type A blood produce anti-B antibodies, and people with type B blood produce anti-A antibodies. Those with type AB blood do not produce either antibody because they have both A and B antigens on their red blood cells (RBCs), which does not trigger the creation of antibodies against these antigens. On the other hand, individuals with type O blood lack both A and B antigens on their RBCs, but their blood plasma contains both anti-A and anti-B antibodies.
People with type O blood are called universal donors because they can donate blood to individuals with any ABO blood type due to the absence of A and B antigens on their RBCs. Conversely, those with type AB blood are known as universal recipients because they can receive blood from any ABO type without the risk of their blood plasma's antibodies attacking the transfused blood, as their plasma does not contain anti-A or anti-B antibodies.