Class 11 Biology Structural Organisation In Animals Organ and organ system

Organ and organ system

  • The basic tissues organize to form organs, which in turn associate to form organ systems in the multicellular organisms.
  • Each organ in our body is made of one or more type of tissues.

For example, our heart consists of all the four types of tissues- epithelial, connective, muscular and neural.

  • The complexity in organ and organ systems displays certain discernable trend. This discernable trend is called evolutionary trend.
  • Morphology is the study of form or externally visible features.
  • Anatomy is the study of morphology of internal organs.


Fig. Heart, an organ

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