february 23, 2015 aim #09: how do cells arrange themselves? do now: read page 52 in text how long is...
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February 23, 2015Aim #09: How do cells arrange
themselves? Do Now:
Read page 52 in text • How long is a single nerve cell in your leg??• Which is bigger, a red blood cell or a human egg
cell?• H.W. Color Cell Due Wednesday• Field Trip March 20th, 2015• Finish Form Fits Function handout by tomorrow
More info on size of cells
• the Ostrich egg is the largest cell on Earth
• It is about the size of a football
• mycoplasma bacterium is the smallest cell in the world.
• It is only ten micrometers
Some Random Cell Facts• The average human being is composed of around
100 Trillion individual cells!!!• It would take as many as 50 cells to cover the area
of a dot on the letter “i”• Cells are the smallest units of living things that can
perform all of the basic life processes
• WOW
Examples of cellsRed Blood cells
Human Nerve cell
Muscle Cells
Sperm Cells
Cells: Size & Shape• Size and Shape depend upon its function.a) Red blood cells are small and disc shaped to fit
through the smallest blood vessel.b) Muscle cells are long and thin. When they
contract they produce movement.c) Nerve cells which carry signals to the brain are
very long.d) Sperm cell have round bodies with whip like tails
that swim to fertilize egg cells
Cells produce tissues
Tissues produce organs
Organs produce organ systems
Organs systems produce organisms
Tissues, Organs, & Systems
• Cells that work together to perform a specific function form a tissue.
• Just as cells that work together form a tissue, tissues that work together form an organ.
• Organs that work together to perform a function form a system. Example: circulatory system.
• Plant cells also form tissues, such as the bark of a tree. And plant cells work together, forming organs, such as roots and leaves.
Multi-cellular Organisms
• Plant cells
Have specialized cells
(like people and other
animals) that might
make up roots or stems.
Groups of similar cells form tissueGroups of similar cells form tissue
Tissue works together as an organTissue works together as an organ
Organs works together as an organismOrgans works together as an organism