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Chapter 5
IV. Cell Specialization &Levels of Organization
Cell Specialization &Organization
• The cells in our body are specialized toperform certain functions.– Ex. The cells lining our stomach are
specialized to secrete mucous anddigestive enzymes
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Cells• The body is made up of individual
cells.
Light receptor cells
muscle cells
nerve cells
mucous cells
Tissues• Cells are grouped into specialized groups called
tissue– Some cells which line the stomach produce digestive
enzymes. Together they make up a tissue.– The cells in our eye which capture light are another
type of tissue.– The cells in our muscle which contract.
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Organs• Organs are made up of groups of tissue which work
together to perform a specific function.– The Heart is made up of muscle tissue, nerve tissue and
connective tissue.– The stomach is made up of muscle tissue and epithelial
tissue.
Organ System• An organ system is a group of organs which
work together to perform a specific function.
Nervous system digestive system
circulatory system
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