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Topic Notes · Easy summaries with diagrams
Chapter 5 — Chapter 5 — Tissues, Organs and Organ Systems
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📘Easy summary
Organisms are built on a pattern of increasing complexity. Levels begin with the simplest — the atom — and progress to the most complex — the organism.
Atom → Molecule → Organelle → Cell → Tissue → Organ → Organ system → Organism.
⭐Key points
- Atom: smallest unit of matter that keeps the property of an element (C, H, O).
- Molecule: atoms combine, e.g. water.
- Organelle: specialized subcellular part, e.g. mitochondria (respiration), ribosomes (protein synthesis).
- Cell: smallest unit with characteristics of life.
- Tissue: group of similar cells performing specific functions (epithelial, muscle, epidermal, vascular).
- Organ: related tissues working together (heart, lungs, leaves, roots).
- Organ system: organs with related functions (circulatory, digestive; root and shoot system).
🔬Diagram
🌿Real-life example
Muscle cells → muscle tissue → heart → circulatory system → you.
💡Exam tip
- MCQ 2: Organelle → Cell → Tissue → Organ → Organ system.
- Learn one plant and one animal example for each level.
✅Quick check
1. A group of similar cells performing a specific function is:
2. Which is an organ in plants?
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