Question

organelle\ttissue\torgan\tsystem
protects by forming a selective barrier
breaks down food for energy
removes waste
provides means of transportation
gives structural support
controls and coordinates actions

Explanation:

1. Protects by forming a selective barrier:

• Organelle: Cell - membrane (it controls what enters and leaves the cell).
• Tissue: Epithelial tissue (covers body surfaces and lines body cavities, acting as a barrier).
• Organ: Skin (the body's largest organ, a protective barrier).
• System: Integumentary system (composed of skin, hair, nails etc., for protection).

1. Breaks down food for energy:

• Organelle: Mitochondria (site of cellular respiration, energy - production).
• Tissue: Smooth muscle tissue (involved in peristalsis in the digestive tract).
• Organ: Stomach (digests food chemically and mechanically).
• System: Digestive system (breaks down food and absorbs nutrients).

1. Removes waste:

• Organelle: Lysosome (contains enzymes to break down waste materials).
• Tissue: Epithelial tissue in kidneys (filters waste from blood).
• Organ: Kidney (filters blood to remove waste and excess water).
• System: Urinary system (removes waste and regulates fluid balance).

1. Provides means of transportation:

• Organelle: Endoplasmic reticulum (transports proteins and other substances within the cell).
• Tissue: Blood tissue (transports oxygen, nutrients etc.).
• Organ: Heart (pumps blood throughout the body).
• System: Circulatory system (transports substances throughout the body).

1. Gives structural support:

• Organelle: Cytoskeleton (provides structural support to the cell).
• Tissue: Connective tissue (supports and binds other tissues).
• Organ: Bone (provides structural support for the body).
• System: Skeletal system (provides support, protection and movement).

1. Controls and coordinates actions:

• Organelle: Nucleus (controls cell activities).
• Tissue: Nervous tissue (transmits electrical signals).
• Organ: Brain (controls and coordinates body functions).
• System: Nervous system (coordinates body activities).

Answer:

	Organelle	Tissue	Organ	System
Breaks down food for energy	Mitochondria	Smooth muscle tissue	Stomach	Digestive system
Removes waste	Lysosome	Epithelial tissue in kidneys	Kidney	Urinary system
Provides means of transportation	Endoplasmic reticulum	Blood tissue	Heart	Circulatory system
Gives structural support	Cytoskeleton	Connective tissue	Bone	Skeletal system
Controls and coordinates actions	Nucleus	Nervous tissue	Brain	Nervous system