Cell Processes

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Cell Processes
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All About Cells!

• Cells are the most basic unit of life.
• What are some ways that cells carry out life
  processes?

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Process Maintaining Homeostasis

• Living cells can only function within a narrow
  range of such conditions as temperature, pH , ion
  concentrations, and nutrient availability.
• Organisms need a way to maintaining internal
  stability in spite of environmental change.

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Process Maintaining Homeostasis
Homeostasis a stable internal environment

• Cell membrane separates the internal
  environment from the outside.

Selectively permeable regulates what enters and
leaves the cell.
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Process Transport of Molecules
All cells acquire the molecules and ions they
need for life from from their surrounding
extracellular fluid
Extracellular fluid
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Simple Diffusion
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Facilitated Diffusion
Glucose molecules
High Concentration
Extracellular fluid
Cell Membrane
Low Concentration
Protein channel
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Osmosis
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Active Transport
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Process Energy conversions
Can you build the photosynthesis equation?
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OSE 12O6 )
GLUC ( C6H
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OSE 12O6 )
GLUC ( C6H
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ENERGY ATP (Adenosine Triphosphate)
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Can you build the equation for cellular
respiration?
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• C6H12O6  6O2    6CO2  6H2O ATP
• (energy for the cell to use for other processes)

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Process Synthesis of New Molecules

• Proteins play a role in nearly all biological
  processes.
• Examples of protein functions
• structure (cell membrane proteins, cytoskeleton
  proteins, proteins of the connective tissue),
• enzymes for cell reactions (enzymes are
  proteins),
• energy storage
• osmotic regulation (albumin),
• transport (membrane channels)
• immune protection (antibodies),
• movement (contractile proteins),
• information (hormones, membrane receptors,
  intracellular signalers)

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The nucleus contains DNA the blueprint for
creating proteins
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Protein synthesis