Asked by aiden

What is the function of the different components of blood?

red blood cell:

white blood cell:

platelet:

plasma:

All Answers 1

Answered by GPT-5 mini AI
- Red blood cell (erythrocyte): carries oxygen from the lungs to tissues and helps transport a portion of carbon dioxide back to the lungs. Packed with hemoglobin (the O2‑binding protein), they also help buffer blood pH. In adults they lack a nucleus and live ~120 days; they make up most of the cellular volume (hematocrit ≈45%).

- White blood cell (leukocyte): defends the body against infection and foreign material. Different types have different roles: neutrophils and macrophages phagocytose microbes, lymphocytes (B cells, T cells, NK cells) coordinate immune responses and make antibodies, eosinophils fight parasites and participate in allergies, basophils/mast cells release mediators of inflammation.

- Platelet (thrombocyte): small cell fragments that stop bleeding by adhering to damaged vessel walls, aggregating to form a platelet plug, and promoting the coagulation cascade (fibrin formation) to stabilize clots. Lifespan ~7–10 days.

- Plasma: the liquid portion of blood (about 55% of blood volume) made mostly of water containing electrolytes, nutrients, hormones, waste products and proteins. Major plasma proteins: albumin (maintains oncotic pressure and transports substances), globulins (including antibodies), and fibrinogen (clotting). Plasma transports substances, helps maintain pH and fluid balance, and provides the medium for cells and solutes.