The Cell Theory

1
The Cell Theory

• Biology 11
• Cell Biology
• Chapter 1

2
The Cellpages 8-10

• smallest living unit
• Basic building block of organisms
• Human body 100 trillion cells
• Different cells are specialized to preform
  different tasks

3
Nerve Cells

• Transmit messages to the body about our
  surroundings and enable us to respond.
• Vision, hearing, taste, smell and touch all
  depend on nerves.

4
Muscle Cells

• Capable of rapid contraction.
• Grouped together to form our muscle groups.

5
Red Blood Cells

• Transport of Oxygen

6
White Blood Cells

• Defense against disease.

7
Special Receptor Cells

• Communicate messages to nerves for relay to nerve
  centres like the brain.

8
Our Body a living ecosystem of cells

• E. coli bacteria in our gut.
• We breathe in plant spores and pollen.
• Microbes and microscopic animal eggs on the food
  we eat.
• All made of cells!
• Outside has cells too fungus and bacteria.

9
Cells in Daily Life

• Yogurt bacteria
• Sour milk bacteria
• Cheese processing
• Yeast cells for bread and beer making
• Leather tanning processes

10
All cells

• Digest nutrients
• Excrete wastes
• Synthesize needed chemicals
• reproduce

11
Cells are.

• The basic unit of all living things!
• Grouped together to form tissues and organs.

12
Cell History

• Robert Hooke, 1665, borrowed the word cell
  (reminded him of the cells in a monastery) to
  describe the honeycomb shape and structure of a
  thin slice of cork he observed under a primitive
  microscope.
• Robert Hooke
• Neglected Hooke
• Anton Van Leeuenhoek, 1674 An Unlikely
  Scientist, made microcsopes and observed blood
  cells, bacteria and single celled organisms.
• Robert Brown, 1831, described the nucleus
• Theodor Schwann and Mathias Schleiden, 1838,
  plant and animal tissue composed of cells
• Louis Pasteur, Very Important Person!
  studied microorganisms.
• Rudolph VIrchow, 1858, All cells come from
  preexisting cells.

13
Modern Cell Theory

• All living things are composed of one or more
  cells.
• The cell is the smallest entity that retains the
  properties of life.
• New cells arise only from cells that already
  exist.
• An expansion.More to the story!