1 - Intro
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levels of organization
- 1. cells
- 2. tissues
- 3. organs
- 4. systems
- 5. organisms
cells are microscopic
measured in micrometers, 10-6 meters
anatomical descriptions are based on the "anatomical position"
- (also called "supine position" when laying flat)
planes of reference
increase in cell size
increase in number of cells
decrease in cell size
change in cells shape
- -Groups of similar cells with a common function.
- -Tissues are precise organizations of similar cells that perform specialized functions.
all basic tissues and organs are derived from these 3 basic embryonic germ layers
- 1. ectoderm
- 2. mesoderm
- 3. endoderm
these steps happen prior to implantation in the uterus
zygote - morula - blastula... then inner cells mass forms embryonic disc.. which forms the 3 germ layers 1. ectoderm 2. mesoderm 3. endoderm
4 basic kinds of tissue
- -connective tissue
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