Cells, Tissues, Organs, Organ systems | Level of organisation in organisms | Easy science video
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Summary
An overview of the life processes required for an organism to be considered alive, followed by an explanation of biological organization from cells to complete systems.
Highlights
Essential Life Processes00:00:00
To be considered alive, organisms must perform seven life processes: movement, respiration, sensitivity, growth, reproduction, excretion, and nutrition.
Cellular Structure00:01:23
Cells are the basic building blocks of life, visible only via microscope. Organisms can be unicellular, like bacteria or yeast, or multicellular, such as plants and animals.
Levels of Organization00:02:04
Biological organization follows a hierarchy: similar cells form tissues, tissues form organs, and organs interact to form systems that create an entire organism.
Organ System Examples00:02:33
Examples of this hierarchy include human muscle cells forming tissue and organs like the heart, as well as plant root cells forming root tissue and transport systems.