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Transcript
Organization of Life
Hierarchy is the organization of structures from smallest and simplest units to largest and most complex
units. The human body has a hierarchical organization.
Human Body ie: you!
And all your organ systems together make up you!
Organ systems ie: respiratory system, digestive system, musculoskeletal system
2+ organs together make up an organ system
Organs
ie: heart, lungs, liver, stomach
2+ tissues (not always same) make up organ
Tissues
ie: muscle tissue, nervous tissue, bone, tendons
Many cells make up a tissue
Cells
ie: 1 skin cell, 1 muscle cell, 1 nerve cell
Cells – are the smallest unit of life.
Cells – are made up of different internal structures called organelles. But these organelles cannot exist
on their own. Thus it is the cell that is the ‘building block of life’!
…………………………………………………………………………………………………………………………………………………………………
Living things (organisms) can be organized too from simple to more complex.
Organism = a living thing
Prokaryotes = cells without a nucleus.
ie: bacteria
Single cell organism
ie: amoeba, paramecium
Plants ie: maple
tree, dandelion
Eukaryotes = cells with a nucleus.
Multicellular organism
Animal ie: cheetah,
humans, goldfish