The Cell is the Basic Unit of Life The Cell is the smallest living organism Unicellular organisms are made of one cell only The cells of multicellular organisms are specialized to perform different functions 1 1

Different kinds of animal cells white blood cell red blood cell cheek cells sperm nerve cell muscle cell Amoeba Paramecium 2 2

Different kinds of plant cells Onion Epidermal Cells Root Hair Cell root hair Guard Cells 3 3

Levels of organization Cells are grouped together and work as a whole to perform special functions 4 4

Cell A living organism which performs ALL of the life processes Cells are the smallest unit of all living organisms 5 5

Two Main Types of Eukaryotic Cells Animal Cell Plant Cell 6 6

Prokaryotes “Nucleoid” region contains the DNA Cell membrane & cytoplasm Bacteria 7 7

Organization… Cells – to – Tissues – to – Organs – to – Organ Systems – to – Organisms! 8 8

copyright cmassengale Tissue A group of similar cells which perform a particular function Animals : epithelial (skin) tissue, muscular tissue Plants : vascular tissue, mesophyll copyright cmassengale 9 9

Organ Different tissues work together to carry out specialized functions Heart : consists of muscles, nervous tissue and blood vessels Leaf : consists of epidermis, mesophyll and vascular tissue 10 10

The Structures of a Leaf (Plant Organ) Chloroplast Palisade Mesophyll Cell Spongy Mesophyll Cell Air Space Stoma copyright cmassengale 11 11

The Structures of a Heart (Animal Organ) 12

System Several organs and tissues work together to carry out a particular function Human: digestive, respiratory, excretory, circulatory and reproductive systems Plant: root and shoot systems 13

Human Body Systems Examples of systems: - Digestive System - Respiratory System - Circulatory System - Nervous System - Reproductive System 14

Levels of Organization CELLS (muscle cells,nerve cells) TISSUES (muscle, epithelium) ORGANS (heart, lungs, stomach) SYSTEMS (circulatory system) ORGANISM (human) 15

It’s You! 16