HB-049 · Cardiovascular · Part
Blood components
Also called: blood cells Sanguis
Schematic 3D Classes 6-8 · Classes 9-10 · Classes 11-12 Beginner Draft - educator review
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Parts: plasma; red blood cells; white blood cells; platelets
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About
Blood is plasma carrying red cells, white cells and platelets.
- 📍 Where it is
- Inside the heart and blood vessels; made in red bone marrow.
- 🧱 Structure
- About 55% plasma and 45% cells: biconcave red cells, several kinds of white cells and small platelet fragments.
- ⚙️ What it does
- Red cells carry oxygen, white cells fight infection, platelets help clotting and plasma carries nutrients, hormones and wastes.
💡 Key facts
- Red blood cells have no nucleus in mammals.
- A drop of blood holds millions of red cells.
- Red cells live about 120 days.
✗ White blood cells are the most common cells in blood
✓ Red cells far outnumber them.
📒 Words to know
- haemoglobin
- oxygen-carrying red protein
- plasma
- liquid part of blood
- platelet
- cell fragment for clotting
🏫 Related lessons
- Animals: life processes and reproduction Classes 6-8
- Life processes Classes 9-10
- Physical fitness and assessment Classes 9-10
Generic GayaGnan topic lessons. Check your own board's syllabus for the exact chapter.
🔎 Sources and credits
Catalog description: Blood as separated educational layers.
- OpenStax Anatomy and Physiology 2e, ch. 18-20 (blood, heart, vessels) (accessed 2026-10-30)
- 3D models: BodyParts3D (DBCLS) and the Human Reference Atlas (HuBMAP), CC BY 4.0, with GayaGnan schematics. 3D model credits
For learning only. This site does not give medical advice, diagnosis or treatment, and it does not collect any health data.