Animal tissues, organs and organ systems

• Muscle Tissue

  Mucle cells can contract (ger shorter). They contain special protin fibers which can change their length.

  Musle cells are also packed full of mitochondriawhich provide he energy needed for contraction

  
• Tissue Defonision

  A tissue is a group of cells with a similar structure and fungtion
• Organ Defonision

  An organ is a group of tissues working together for a specific function e.g the stomach. The stomach containes muscle tissue and glandular tissues (which release enzymes)
• Organs Defontion

  Organs are grouped into organ systems which work together to form organisms