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7.4 Homeostasis and Cells

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7.4 Homeostasis and Cells Cells have the same basic composition, and the same kinds of organelles, but not all living things are the same Cells are specialized and ... – PowerPoint PPT presentation

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Title: 7.4 Homeostasis and Cells


1
7.4 Homeostasis and Cells
  • Cells have the same basic composition, and the
    same kinds of organelles, but not all living
    things are the same
  • Cells are specialized and associate with other
    cells in special ways

2
How do unicellular organisms maintain homeostasis?
  • Homeostasis relatively constant internal
    physical and chemical conditions
  • What workbook question deals with the definition
    of homeostasis?
  • 1
  • Whats the answer to 6?

3
6. Unicellular Organisms
  • Single-celled organisms
  • Maintain homeostasis
  • Grow
  • Respond to the environment
  • Transform energy
  • Reproduce

4
7. Why is that important to single-celled
organisms?
  • They consist of only ONE cell, so homeostasis is
    vital to their life. If they lose the ability to
    keep their internal conditions stable, they face
    immediate death

5
What are the types of unicellular organisms?
  • Look at 2 - 5

6
Types of Unicellular Organisms
  • Eukaryotes
  • Protozoa (picture on p214),
  • Algae have chloroplasts, found in water
  • Yeast (a unicellular fungi) used in baking
    bread and other foods
  • Prokaryotes
  • Bacteria highly adaptive and can live almost
    anywhere
  • Both prokaryotes and eukaryotes, though
    unicellular, ARE alive and maintain homeostasis

7
8. How are cells of multicellular organisms like
a baseball team?
8
Multi-cellular Organisms
  • Cells have a certain job in the body and are
    specialized for their task
  • Members of a baseball team have different jobs
    coach, catcher, pitcher, fielders, trainers
  • Need to communicate effectively
  • So do cells!

9
9. How does a multicellular organism maintain
homeostasis?
  • Specialized cells from various parts of the body
    work together and communicate effectively
  • Cooperate with each other for survival of the
    organism

10
Some specialized cells -
  • Fig 7-22 p.215 Human trachea epithelial cells -
    have cilia to catch debris when you breathe in
    air
  • Fig 7-23 Pollen grains from pine tree
  • Tiny, lightweight, protective covering
  • Float in the wind until they land on seed cone

11
10. What are the levels of organization that
make up a multicellular organism?
  • Most basic level is

12
Levels of Organization
  • Cells make
  • Tissues, which make
  • Organs, which make
  • Organ systems, which makes
  • Organisms
  • Where would youput organism?Another organ?

13
STOP HERE
  • The following slides are from LAST YEAR. We
    arent doing this part!

14
Cellular Communication
  • Cells are specialized, but interdependent
  • Cells MUST communicate effectively
  • Some cells form a connection to another cell,
    called cellular junctions

15
  • Signals pass through junctions, but only if they
    have the right receptor specific protein that
    has specific shape that molds to a specific
    molecular messenger
  • Ex junctions in the heart electrical signals
    pass through junctions to make heart contract and
    pump blood

16
Pop Quiz!
  • 1. What is homeostasis?

The relatively constant internal physical and
chemical conditions that occurs in both
unicellular and multicellular organisms
17
  • 2. What do unicellular organisms do to maintain
    homeostasis?

Grow, respond to the environment, transform
energy, and reproduce
18
3. What does it mean that cells are specialized?
  • Cells have different tasks or roles to carry out
    that require them to have a specific structure
  • Ex Cilia on trachea cells

19
4. What are 2 things that help cells communicate
and maintain homeostasis?
  • Cellular junctions (connections to other cells)
  • Receptors (molecule that other cells can bind to)
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