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Organ structure and functions

Organisation • Principles of organisation

Key concepts

What you'll likely be quizzed about

  • An organ is a group of tissues that performs a specific function for an organism.
  • Tissues within an organ have distinct structures and roles but collaborate so that the organ fulfills a single, recognizable task.
  • The organizational hierarchy places organs above tissues and below organ systems, linking cellular processes to broader bodily functions.

Flashcards

Test your knowledge with interactive flashcards

What is the primary function of the liver as an organ?

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The liver produces bile to aid fat digestion and metabolizes nutrients; bile is stored in the gall bladder before entering the small intestine.

Key notes

Important points to keep in mind

An organ consists of two or more tissue types arranged to perform a specific function.

Organs sit between tissues and organ systems in the organizational hierarchy.

Muscle tissue provides movement, epithelial tissue forms protective linings, connective tissue supports structures, nerve tissue coordinates activities.

Adequate supply of blood or xylem/phloem is essential for organ performance; poor supply limits function.

Surface area and diffusion distance determine exchange efficiency for organs involved in absorption or gas exchange.

Organs combine into systems; loss of any organ’s function can impair the entire system.

Plant roots, stems, and leaves are organs adapted for absorption, transport, and photosynthesis, respectively.

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