LEVELS OF ORGANIZATION IN ORGANISMS MULTICELLULAR ORGANISMS ARE

LEVELS OF ORGANIZATION IN ORGANISMS

MULTICELLULAR ORGANISMS ARE ORGANIZED

THERE ARE 4 LEVELS IN AN ORGANISM • Cell • Tissue • Organ System

CELL • Smallest level • The basic unit of structure within all living things • Cells perform processes that keep organisms alive but also can have specialized jobs

TISSUE • Large numbers of specialized and similar cells • Working together to perform the same function • Humans have 4 types • Plants have 3 types

ORGAN • Two or more different types of tissues • Work together to perform a specific job

ORGAN SYSTEM • A group of 2 or more dissimilar organs • Work together to perform a specific function • Humans have 11 organ systems

QUESTIONS TO ASK YOURSELF WHEN DETERMINING LEVELS OF ORGANIZATION Is it made of more than one cell? • Is it a large group of similar cells? • Are different types of cells formed together? • Are there 2 or more organs connectedd and working together? • The next few slides show an assortment of items. As a group, classify the items as either: e u s tis scell o r Organ S N A ORG

PLANT

PLANT VACUOLE

PLANT LEAF CROSS SECTION

PLANT FLOWER PARTS

PLANT ROOTS

PLANT WATER TRANSPORT

ANIMAL NERVE

ANIMAL RED BLOOD

ANIMAL HEART MUSCLE

PLANT ROOTS STEMS LEAVES

ANIMAL

ANIMAL HUMAN BRAIN AND SPINE

AND THE ANSWERS ARE…… • Cells • Plant cell vacuole • Red blood cell • Nerve cell • Organs • Plant leaf • Plant roots stems leaves • Animal organs • Tissues • Heart muscle • Elodea leaf • Plant water transport (vascular tissue) • Organ • Root System system • Flower reproductive parts • Human brain and spine