Final answer:
Blood types are determined by the presence or absence of certain antigens on the surface of red blood cells. The average adult human has about 5 liters of blood in their body. Platelet concentration in the blood is measured as the number of platelets per microliter.
Step-by-step explanation:
Cause of Different Blood Type Groups
Blood types are determined by the presence or absence of certain antigens on the surface of red blood cells. These antigens are inherited from parents and are determined by specific genes. For example, the ABO blood group system is determined by genes that control the production of antigens A and B. The presence of antigen A results in blood type A, the presence of antigen B results in blood type B, the presence of both antigens A and B results in blood type AB, and the absence of both antigens A and B results in blood type O. Another blood group system, the Rh system, is determined by the presence or absence of the Rh antigen. A person with the Rh antigen is Rh positive (Rh+), while a person without the Rh antigen is Rh negative (Rh-).
Blood Volume in the Body
The average adult human has about 5 liters (or 1.3 gallons) of blood in their body. The exact amount of blood varies depending on factors such as body size and overall health. Blood volume is important for maintaining blood pressure and delivering oxygen and nutrients to cells throughout the body. It is regulated by various factors, including hormones and the balance of fluids and electrolytes.
Platelet Concentration
Platelets are small, disk-shaped fragments of cells that play a crucial role in blood clotting. The concentration of platelets in the blood is typically measured as the number of platelets per microliter of blood. The normal range for platelet concentration is around 150,000 to 450,000 platelets per microliter. Platelet concentration can be affected by various factors, including certain medications, medical conditions, and disorders that affect platelet production or function.