LEVELS OF ORGANIZATION

CTO3

CellsThe basic structure of living things

Human body contains about 100 trillion cells

UNI CELLULAR ORGANISMS

• CELL = ORGANISM

• No levels

• Each type of cell is different organism.

MULTI CELLULAR ORGANISMS

• Cells - Tissue - Organ - System - Organism

• Different types of cells are needed to create different levels.

SPECIALIZATION• In MultiCellular organisms, Cells

differ from one another for different jobs.

• In UniCellualr organisms- only one cell.

TISSUE• GROUP OF

SAME CELLS

• 4 MAIN TYPES:

–CONNECTIVE

–MUSCLE

–NERVOUS

–EPITHELIAL

TISSUECONNECTIVE

Connects other tissues together.

ie: Fat, cartilage, bones, blood, ligaments and tendons.

EPITHELIAL

Covers the surface of your body

and lines the inside of organs.

TISSUEMUSCLE

Movement of the body’s functions.

ie: voluntary & involuntary.

NERVOUSControls & coordinates all body functions.ie: brain,

nerves

4 KINDS of TISSUE

(group of same cells)

WHAT TYPE OF TISSUE?

ORGAN Different tissue types working together with specific job.

ie: stomach

ORGANS(group of diff. tissues)

ORGAN SYSTEMS• A group of

organs and parts that work together to perform a specific job.

SYSTEMS( group of diff. Organs)

Integumentary system

SKELETAL SYSTEM

MUSCU-LAR

SYSTEM

RESPIRATORY SYSTEM

CIRCULATORY SYSTEM

All together =

ORGANISM

ORGANISM• Multi-cellular Organisms: Single

living unit composed of different systems working together. CTO3

• Uni-cellular Organisms: Single living unit composed of a single cell. C = O

Remember: ORGANISM POPULATION

COMMUNITY ECOSYSTEM

Officer Pete

Come Eat