Low BCR-ABL Expression Levels in Hematopoietic Precursor Cells
Levels of Organization - Science to a Tee · Levels of Organization. CELLS ! TISSUE ! SYSTEMS !...
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HIERARCHY OF STRUCTURE IN ANIMALS Levels of Organization
Transcript of Levels of Organization - Science to a Tee · Levels of Organization. CELLS ! TISSUE ! SYSTEMS !...
HIERARCHY OF STRUCTURE IN ANIMALS
Levels of Organization
CELLS ! TISSUE ! SYSTEMS ! ORGANISMS
Least Complex Most Complex
LEVEL 1!CELLS
■ basic unit of life
■ serve a specific function within the organism ■ Ex: bone cells, blood cells, nerve cells
stem CELLS Bone CELLS cheek CELLS Blood CELLS
LEVEL 2!TISSUES■ Made up of cells that are similar in structure and
function
■ Cells work together to perform a specific activity ■ TYPES
Muscle
Connective
Epithelial
Nervous
TISSUE Type
Example Description Function
Epithelial •Skin
•Lining of digestive system
Thin sheets of tightly packed cells covering
surfaces and lining internal organs
Protection from drying rubbing
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TISSUE Type
Example Description Function
Connective
•Bone
•Cartilage
•Tendon
• Some Cells and fibres that hold other tissues
together
• Some are structural and
supportive
• Support
•Insulation
•Connecting
CONNECTIVE TISSUE
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CARTILAGE
Type Example Description Function
Muscle
• Skeletal (voluntary)
• Smooth (involuntary)
• Cardiac
Anchored by tendons to bones
Walls of the digestive system
Forms the heart
Movement
CardiacVoluntary (skeletal)
Smooth
Type Example Description Function
NervousBrain
Nerves in sensory organs
Long thin cells with branches
Sensory- Communication
between brain and organs
LEVEL 3!ORGANS■ Tissues that work together to perform a specific
activity
■ Most organs work within a single organ system -Stomach is part of the digestive system
■ Some organs work within more than one system
eg. Pancreas is part of the digestive and endocrine system
LEVEL 4!SYSTEMS■ Groups of two or more organs that work together
to perform a specific function for the organism
System function
DIGESTIVE Obtain food/breakdown
CIRCULATORY Transport nutrients
RESPIRATORY Draw in oxygen, expel carbon dioxide
MUSCULAR All movement
SKELETAL Supporting the protecting
LEVEL 5!ORGANISM■ Entire living things that carry out all basic life processes. ■ Usually made up of organ systems but may be made of one cell
■ Examples ■ Bacteria, amoeba, mushroom, ■ sunflower, human
