7.4 homeostasis

7/24/2019 7.4 homeostasis

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7.4 Homeostasis and CellsCells have the same basic

composition, and the same kindsof organelles, but not all livingthings are the same

Cells are specializedandassociate with other cells in

special ways


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How do unicellular organisms

maintain homeostasis? Homeostasis relatively constant

internal physical and chemical

conditions hat workbook !uestion deals

with the de"nition of homeostasis#

$%

hat&s the answer to $'#


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$'. (nicellular )rganisms

*ingle+celled organisms

Maintain homeostasis

Grow

Respond to the environment

Transform energy

Reproduce


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7. Why is that important to

single-celled organisms? They consist of only ONE cell so

homeostasis is !ital to their life. "f they lose

the a#ility to $eep their internal conditionssta#le they face immediate death


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What are the types of unicellular

organisms? %oo$ at &' - (


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-ypes of (nicellular

)rganisms ukaryotes Protozoa/picture on p0%41, Algae have chloroplasts, found in water

Yeast/a unicellular fungi1 used inbaking bread and other foods

2rokaryotes

Bacteria highly adaptive and can live

almost anywhere 3oth prokaryotes and eukaryotes, though

unicellular, 5 alive and maintainhomeostasis


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&). How are cells of multicellular

organisms li$e a #ase#all team?


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6ulti+cellular )rganisms Cells have a certain ob in the body

and are speciali8ed for their task

6embers of a baseball team have

di9erent obs coach, catcher,pitcher, "elders, trainers

:eed to communicate e9ectively

*o do cells;


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&*. How does a multicellular

organism maintain homeostasis? +peciali,ed cells from !arious parts of the

#ody wor$ together and communicate

effecti!ely

ooperate with each other for sur!i!al of

the organism


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*ome speciali8ed cells +


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&/. What are the le!els of organi,ation

that ma$e up a multicellular organism? 0ost #asic le!el is1


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?evels of )rgani8ation Cells make@

-issues, which make@

)rgans, which make@

)rgan systems,which makes@

)rganisms

here would youput organism#nother organ#


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+TO2 HE3E

The following slides are from %4+T

5E43. We aren6t doing this part


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Cellular Communication

Cells are speciali8ed, butinterdependent

Cells 6(*- communicate e9ectively

*ome cells form a connection to

another cell, called cellular unctions


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*ignals pass through unctions, butonly if they have the right receptor

speci"c protein that has speci"cshape that molds to a speci"cmolecular messenger

A unctions in the heart electrical

signals pass through unctions tomake heart contract and pump blood


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2op Bui8;

%. hat is homeostasis#

-he relatively constant internalphysical and chemical conditions thatoccurs in both unicellular andmulticellular organisms


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0. hat do unicellular organisms doto maintain homeostasis#

row, respond to the environment,transform energy, and reproduce


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>. hat does it mean that cellsare Dspeciali8edE#

Cells have di9erent tasks or roles to

carry out that re!uire them to have aspeci"c structure

A Cilia on trachea cells


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4. hat are 0 things that help cellscommunicate and maintain

homeostasis#

Cellular unctions /connections to othercells1

5eceptors /molecule that other cells canbind to1

7.4 homeostasis

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