Biology / Unit 1 Bio 0062 short lesson, about 20 seconds
Levels of Organization: Tissue to Organism
Captions available
The idea
Cells of a similar kind form tissues, tissues combine into organs, organs into organ systems, and organ systems into one organism.
In practice
Heart muscle cells form cardiac tissue, part of the heart, which works with vessels as the circulatory system in one animal.
Where people slip
A single-celled organism skips every rung between cell and organism, since one cell is already the whole living thing.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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