Blood Components and Their Functions

Steps:

• Recall plasma's role: carries water, nutrients, hormones, and waste in blood.
• Identify platelets' function: fragments that initiate clotting to stop bleeding.
• Note white blood cells' primary job: defend against infection via antibody production and phagocytosis.
• Match these to options, selecting the one aligning all correctly.

Why D is correct:

• Plasma transports nutrients as the liquid matrix dissolving glucose and amino acids; platelets enable clotting by aggregating at injury sites; white blood cells form antibodies in immune responses, per basic hematology definitions.

Why the others are wrong:

• A: Plasma does not form antibodies (that's leukocytes); platelets do not transport nutrients.
• B: Plasma does not clot (that's platelets); white blood cells do not transport nutrients.
• C: Plasma does not clot; platelets do not form antibodies; white blood cells do not transport nutrients.

Final answer: D