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Chapter 7Cell Structure & Function

Section 7-4Section 7-4

The Diversity of Cellular LifeThe Diversity of Cellular Life

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Unicellular Organisms

• Cells Are:Cells Are:– The Basic Living Units Of All OrganismsThe Basic Living Units Of All Organisms

• Unicellular OrganismsUnicellular Organisms– GrowGrow

– RespondRespond

– ReproduceReproduce

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Unicellular Organisms

• ProkaryotesProkaryotes• Live EverywhereLive Everywhere

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Unicellular Organisms

• EukaryotesEukaryotes–Many live their entire lives as Many live their entire lives as

single cellssingle cells

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Unicellular Organisms

• EukaryotesEukaryotes• Some protists and algae are Some protists and algae are

unicellular but live in coloniesunicellular but live in colonies

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Multicellular Organisms

Key ConceptKey Concept::Cells In Multicellular Organisms Cells In Multicellular Organisms

Are Specialized To Perform Are Specialized To Perform Particular Functions Within The Particular Functions Within The OrganismOrganism

Cell SpecializationCell Specialization

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Red Blood Cells

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Pancreatic Cell

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Nerve Cells

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Muscle Cells

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Levels of Organization

Key ConceptKey Concept::The Levels Of Organization In A The Levels Of Organization In A

Multicellular Organism Are:Multicellular Organism Are:Individual CellsIndividual CellsTissuesTissuesOrgansOrgansOrgan SystemsOrgan Systems

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Cells

SpecializationSpecialization

AndAnd

InterdependenceInterdependence

Make Multicellular Organisms Make Multicellular Organisms WorkWork

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Tissues

• Group Of Similar Cells That Group Of Similar Cells That Perform A Particular FunctionPerform A Particular Function

• Four Main Types:Four Main Types:– MuscleMuscle

– EpithelialEpithelial

– NervousNervous

– ConnectiveConnective

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Organs

• Many Groups Of Tissues Working Many Groups Of Tissues Working TogetherTogether

• Muscle Tissue Contains:Muscle Tissue Contains:

– Muscle CellsMuscle Cells

– Nerve CellsNerve Cells

– Connective Tissue CellsConnective Tissue Cells

– Blood SupplyBlood Supply

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Organ Systems

A Group Of Organs Working Together To A Group Of Organs Working Together To Perform A Specific FunctionPerform A Specific Function

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Organ Systems

• NervousNervous

• SkeletalSkeletal

• MuscleMuscle

• IntegumentaryIntegumentary

• CirculatoryCirculatory

• RespiratoryRespiratory

• DigestiveDigestive

• ExcretoryExcretory

• EndocrineEndocrine

• ReproductiveReproductive

• ImmuneImmune