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Cells and organization
A cell is a basic unit of living organisms. In multicellular organisms, specialized cells form tissues, tissues form organs, and organs work in systems. Plant and animal cells share features but are not identical.
Cell membranes regulate exchange with the surroundings. Many plant cells contain chloroplasts for photosynthesis and have a cell wall. Not every cell has every structure shown in a simplified diagram.
Worked example
Muscle cells form muscle tissue; muscle tissue contributes to organs such as the heart.
Try it yourself
Draw a simplified plant cell and label the membrane, wall and nucleus.
Check your understanding
Which structure is characteristic of plant cells but not animal cells?
Plant cells have cell walls; animal cells do not.
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