Question

lo 2.1. what are the three main components of blood?
plasma, hemoglobin, and fibrinogen.
hemoglobin, platelets, and leukocytes.
hemoglobin, plasma, and leukocytes.
red blood cells, white blood cells, and platelets.
plasma, antibodies, and antigens.

Explanation:

Blood is composed of plasma (the liquid part) and formed elements. The formed elements include red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes). Hemoglobin is a protein in red blood cells, not a main component. Fibrinogen is a protein in plasma. Antibodies and antigens are related to immune function but not main components.

Answer:

Red blood cells, white blood cells, and platelets.