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Growth & DevelopmentTransition from 1 cell to multi-cellular organism
Timeline
• Fertilization Sperm & egg join to form zygote• Cleavage rapid cell division•:
• Fertilization Sperm & egg join to form zygote
• Cleavage rapid cell division• Morula: • 16 cells
• Blastula:• 128 cells
Timeline (cont)
Differentiation transition from general to specialized Totipotent▪ Ability to form all cell/tissue types▪ Ex: zygote
Pluripotent▪ Ability to form many cell types▪ Stem cells▪ blastula
Timeline (cont) Gastrula
3 layered embryo Ectoderm:▪ Outer layer▪ Skin, nervous system, outer openings
Endoderm:▪ Inner layer▪ Organs (lungs, digestive tract, etc.)
Mesoderm▪ Middle layer▪ Muscles, bone, blood, fat
Tissues
Epithelial Inner/outer lining Regulation
Connective Between other tissues Support & structure
Muscle On bones & w/in organs Movement
Nervous Thru-out body Respond to stimuli
Epithelial Tissue
Classification # of cells▪ Simple (1 layer)▪ Stratified (>1 layer)▪ Psuedostratified
Shape▪ Cuboidal (square)▪ Columnar (rectangular)▪ Squamous (flat tiles)
Connective Tissue
Classification types of fibers Dense
(collagenous)▪ Strong durable
Elastic▪ Flexible, stretch
Loose (reticular)▪ Thin, branched
Connective Tissue (cont)
Types Areolar (surround organs) Adipose (protect) Fibrous▪ Tendons (MB)▪ Ligaments (BB)
Cartilage Bone Blood
Muscle Tissue
Classification Striations (stripes) Voluntary/Involuntary
Types Skeletal▪ Striated▪ Voluntary▪ Found on bones
Muscle Tissue (cont)
Cardiac▪ Striated▪ Involuntary▪ Heart
Smooth▪ No striations▪ Involuntary▪ Lines organs
Nervous Tissue
Transmit electrical impulses
Dendrite Conduct
electrochemical signals w/in nervous system
Axon Transmission of
signals from nervous to other tissues
Organs
Built from 2/more types of tissues