Bio 5.5

Biology 5.5

Multicellular Life​

By MISS MENDOZA

​V. Multicellular Life (5.5)

A. Multicellular organisms depend on interactions among different cell types

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1.Cells communicate and work together in groups that form increasingly large, more complex structures​

a. CELLS → TISSUES → ORGANS → ORGANSYTEMS

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b. Tissue - group or cells that work together to perform a particular function

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c. Organ - group of tissues that work together to perform specific function or related functions​

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d. Organ system - organs that carry out similar functions

1)Organ systems work together to maintain homeostasis

2)Occurs in plants and animals

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Multiple Choice

What are tissues?

• cells that work together

• cells that reproduce

• cells that don't exist

• cells that sleep

Multiple Choice

Organ systems work together to maintain what?

• homeostasis

• differentiation

B. Specialized cells perform specific functions

  1. Cell differentiation - process by which   unspecialized cells develop into their mature forms and functions

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a. Every cell in body has full set of DNA

b. Cells only use certain genes and become specific (ie. bone cells,  muscle cells, nerve cells, etc.)​

Multiple Choice

Every cell in the body has a full se of what?

• RNA

• Food

• DNA

• Children

Multiple Choice

How do cells become specific?

• using certain genes

• using certain rna

• using glucose

• going to sleep

C. Stem cells can develop into different cell types

  1. Stem cells - unique type of body cell

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a. Can divide and renew themselves for long periods of time

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b. Remain undifferentiated in form

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c. Develop into a variety of specialized cell types

​ 2. Stem cells can be categorized by their ability or potential to develop into differentiated cell types and different tissues

Multiple Choice

What is a stem cell?

• body cell that elongates

• identical type of body cell

• unique type of body cell

​3. Adult Stem Cells - partially undifferentiated cells located among the specialized cells or many organs and tissues

4. Embryonic Stem Cells - come from donated embryos grown in a clinic

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5.Research and Treatment Hope

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a. Stem cells have long been used to treat leukemia and lymphoma

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b. Might be used to repair damaged organs

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c. Used to cure diseases (i.e. diabetes)

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