Plasma is not a cellular component but a vital fluid in blood, comprising nutrients and hormones. Red blood cells, white blood cells, and platelets perform specialized functions in circulation. Here option D is correct.
Blood is a vital bodily fluid with four main components: red blood cells (erythrocytes), white blood cells (leukocytes), platelets (thrombocytes), and plasma. Plasma, while crucial for maintaining overall blood volume and transporting various substances, is not considered a cellular component.
Instead, it is a straw-colored liquid that makes up about 55% of total blood volume and serves as a medium for transporting nutrients, hormones, and waste products. Plasma also plays a key role in maintaining osmotic balance and clotting.
The cellular components—red blood cells, white blood cells, and platelets—perform specialized functions, such as oxygen transport, immune defense, and blood clotting, respectively, making them integral components of the circulatory system. Here option D is correct.
Complete question:
Blood is made up of four components, which of the following is NOT one of those components?
A) Red blood cells
B) White blood cells
C) Platelets
D) Plasma