Final answer:
Blood consists of plasma, red and white blood cells, and platelets. Each component plays a specific role in body functions and may be the subject of a transfusion to treat various conditions like anemia, immunodeficiencies, and clotting disorders.
Step-by-step explanation:
Components of Blood and Transfusion Needs
Blood is vital for carrying nutrients, gases, and wastes throughout the body, defending against infections, and maintaining homeostasis. The components of blood include plasma, red blood cells (RBCs), white blood cells (WBCs), and platelets. Plasma is mostly water, containing plasma proteins like albumin, globulins, and fibrinogen, as well as electrolytes and gases, making blood a sticky fluid. Plasma is necessary for carrying these proteins and solutes throughout the body.
Red blood cells are specialized for oxygen delivery to body cells due to the presence of hemoglobin. Patients with anemia may require RBC transfusions to alleviate symptoms like fatigue and shortness of breath caused by low oxygen-carrying capacity. White blood cells play a key role in the immune response, and individuals with leukopenia might need WBC transfusions to bolster their immune system. Platelets and clotting factors in plasma are crucial for blood coagulation; those with clotting disorders may receive transfusions of platelets or plasma to prevent excessive bleeding.