Cells

• Objective: Students will be able to describe cell theory how cells are organized in multicellular organisms

An overview of cells

What is a cell?

• cell – the most basic unit of structure and function in living things.

• Determine structure of living things

• Cells are involved in all functions of living things

• Cells are too small to see

Development of Cell Theory

ALL living things madeof cells

Cells are basic units ofstructure and function inliving things

ALL cells are produced from other cells

Development of Cell Theory

• “all cells come from cells”

• Cell Theory:

1. All living things made of cells2. Cells are the basic units of structure and

function in living things3. All cells are produced from other cells

Unicellular & Multicellular

Unicellular

Multicellular

tissuecells organ organ system

organization

Unicellular & Multicellular• Unicellular: single celled organisms

– Ex. Bacteria

• Multicellular: many celled organisms

– Cells organized into:1. Tissues – group of similar cells (stomach tissue)

2. Organs – group of tissues (stomach)

3. Organ Systems – group of organs (digestive system)