MEDICAL BIOLOGY, HUMAN ANATOMY, PHYSIOLOGY AND PATHOLOGY - Ya.I. Fedoniuk 2010

BIOLOGY

SECTION 1. BIOLOGICAL FOUNDATIONS OF HUMAN VITAL ACTIVITY

1.3. MOLECULAR-GENETIC AND CELLULAR LEVELS OF LIFE ORGANIZATION

1.3.1. The cell as the elementary genetic, structural, and functional unit of life

Specialization and integration of Cells in Multicellular Organisms

According to Cell Theory, multicellular organisms are complex ensembles of cells integrated into cohesive systems of Tissues and Organs, which are subordinated and interconnected through intercellular, humoral, and neural forms of regulation. Regardless of the type of activity of a multicellular Organism we consider (movement, response to stimuli), each is performed by specialized cells. Cell specialization for specific Functions emerged during evolution and is associated with differentiation. Differentiation is The Emergence of differences among cells derived from uniform material As a result of the selective activity of various genes during The Development of a multicellular organism. The Cell is the Structural and functional unit in a multicellular organism. However, cells do not exist in isolation; they are integrated into tightly interconnected tissues and organs. The unification and coordination of structures and functions at any level of biological Organization is termed integration. Thanks to integration, the multicellular organism functions as a unified whole.



Last update: 08/08/2026

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