33 Cell Processes Necessary for Life

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3-3Cell Processes Necessary for Life

• 5 Processes

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Metabolism

• All cell activities that build up or break down
  substances in the cell.
• It results in the release of energy that is
  stored in the cell.

3
Respiration

• occurs in the mitochondria to make energy.
• 2 types of respiration
• Aerobic (with oxygen) Your food combines with
  oxygen
• Glucose oxygen CO2 H2O ATP molecule
  (energy unit)
• Anaerobic (without Oxygen) Other wise known as
  fermentation.
• Makes less energy
• Yeast use this process, so do our muscles when
  they run out of oxygen.
• Glucose CO2 Alcohol ATP

4
Diffusion

• Food, water, oxygen and other materials enter the
  cell through pores in the cell membrane
• No Energy Is Needed for this process.
• Things move from an area of high concentration to
  an area of low concentration.
• Concentration is a measure of how much stuff is
  dissolved I in water
• The cell membrane is selectively permeable- only
  certain items can flow through the cell
  with ease.
• Oxygen, water and food can come in
• Waste material can move out.
• The organelles stay in

5
Osmosis

• Diffusion of water through the cell membrane.
• The cell likes to be even with the outside
  environment. To get even, the cell moves water
  into or out of the cell in order to balance the
  inside with the outside.
•  
• A cell in an outside high concentration of salt,
  low water concentration will shrink by allowing
  water to flow out of the cell, trying to make
  their cell have the same concentration of water.
  hypotonic
• A cell in a low concentration of salt, high water
  concentration will expand by allowing water to
  follow into the cell, trying to make their cell
  have the same concentration of water. Hypertonic
  

6
Active Transport

• Movement of material across the cell membrane to
  bring materials into the cell, or to remove
  wastes from the cell.
• The materials brought in can not diffuse across
  the membrane
• IT NEEDS AND USES ENERGY TO DO THIS PROCESS
• It brings in things that the cell does not
  diffuse through the membrane
• It brings in materials opposite of the
  concentration