Here's a breakdown:
* Formed elements make up about 45% of the blood volume and include:
* Red blood cells (erythrocytes): Carry oxygen throughout the body.
* White blood cells (leukocytes): Fight infections and other diseases.
* Platelets (thrombocytes): Help stop bleeding by clotting the blood.
* Plasma makes up the remaining 55% of blood volume and is the liquid part of the blood. It contains dissolved substances like proteins, nutrients, and waste products.
So, while cells are the most prominent components of formed elements, the term also encompasses platelets, which are cell fragments, as well as any other undissolved particles that may be present in the blood.
