Ima

Cells:

• Cells are the basic structural and functional units of life.

• They carry out essential processes like energy production, protein synthesis, and waste removal.

• Examples: muscle cells, nerve cells, blood cells.

Tissues

• Tissues are groups of similar cells working together to perform a specific function.

• Four main types in animals:

  • Epithelial tissue: covers surfaces, lines organs.

  • Connective tissue: supports and binds (bone, blood, cartilage).

  • Muscle tissue: enables movement.

  • Nervous tissue: transmits signals.

Organs

• Organs are structures made of different tissues working together for a specific function.

• Examples:

  • Heart: pumps blood.

  • Lungs: exchange oxygen and carbon dioxide.

  • Brain: controls body activities.

  • Stomach: digests food.