Glucose The Main Energy Source for Cells

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GlucoseThe Main Energy Source for Cells
Glucose contains WAY too much energy for the cell
to use at one time! So what has to happen?
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ATP

• One Powerful Molecule

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ATP/ADP Cycle

• Glucose enters a cell.
• It is broken down releasing energy from its bonds
• This energy is stored in a bond between a
  molecule of ADP and a phosphate (P) molecule
  resulting in an ATP molecule.
• When this energy is needed, the last phosphate
  molecule (P) is broken off, releasing the stored
  energy from the bond. ADP results.

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ATP/ADP Cycle
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Types of Cellular Work

• Chemical Work building a large molecule
• Mechanical Work moving a muscle protein
• Transport Work pumping molecules across a
  membrane

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Types of Cellular Work
Warm-blooded animals use heat given off in
respiration to maintain a warm body temp. This
polar bear can be active in many different
climates.
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Types of Cellular Work
Nerve cells are able to transmit impulses by
using ATP to power the active transport of
certain ions.
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Types of Cellular Work
Some cells as muscle cells and cells with cilia
or flagella use energy from ATP in order to move.
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Types of Cellular Work
Fireflies and some caterpillars produce light by
a process called bioluminescence. The light
results from a chemical reaction that is powered
by the breakdown of ATP.
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