Chapter 3Chapter 3

Section 1 ContinuedSection 1 Continued

Recite VocabularyRecite Vocabulary

CellCell Cells are the basic units of structure Cells are the basic units of structure

and function in living things.and function in living things.

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Cell TheoryCell TheoryCell theory states the following:Cell theory states the following:

All living things are composed of All living things are composed of cells.cells.

Cells are the basic units of structure Cells are the basic units of structure and function in living things.and function in living things.

All cells are produced from other All cells are produced from other cells.cells.

Recite VocabularyRecite Vocabulary

UnicellularUnicellular Unicellular organisms are single-celled Unicellular organisms are single-celled

organisms, including bacteria; the most organisms, including bacteria; the most numerous organisms on Earth.numerous organisms on Earth.

MulticellularMulticellular Multicellular organisms are composed Multicellular organisms are composed

of many cells.of many cells.

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TissueTissue A tissue is a group of similar cells that A tissue is a group of similar cells that

work together to perform a specific work together to perform a specific function.function.

OrganOrgan An organ is made up of different kinds of An organ is made up of different kinds of

tissues that work together.tissues that work together. Organ SystemOrgan System

An organ system is a group of organs that An organ system is a group of organs that work together to perform a major function.work together to perform a major function.

First Observations of First Observations of CellsCells

The invention of the microscope The invention of the microscope made it possible for people to made it possible for people to discover and learn about cells.discover and learn about cells.

Robert Hooke and Anton van Robert Hooke and Anton van Leeuwenhoek built their own Leeuwenhoek built their own microscopes.microscopes.

Discovering Cells

Discovery of the CellDiscovery of the Cell

What was Robert Hooke’s What was Robert Hooke’s contribution to the study of cells?contribution to the study of cells? Hooke was one of the first people to Hooke was one of the first people to

observe cells. He gave them their name.observe cells. He gave them their name. What did Anton van Leeuwenhoek use What did Anton van Leeuwenhoek use

his microscope to study?his microscope to study? Lake water, scrapings from his teeth and Lake water, scrapings from his teeth and

gums, water from rain gutters, and tiny gums, water from rain gutters, and tiny moving organisms that he named moving organisms that he named animalcules.animalcules.

Discovery of the CellDiscovery of the Cell

How did the invention of the How did the invention of the microscope help advance the study of microscope help advance the study of life science?life science? The invention of the microscope made it The invention of the microscope made it

possible to discover and learn about cells.possible to discover and learn about cells. Why do you think people were so Why do you think people were so

interested in seeing Hooke’s drawings?interested in seeing Hooke’s drawings? They were drawings of things that up until They were drawings of things that up until

then had been invisible, so the book opened then had been invisible, so the book opened up a whole new world to people.up a whole new world to people.

Discovery of the CellDiscovery of the Cell How did each advance influence How did each advance influence

the next scientist’s work?the next scientist’s work? The work of each scientist built The work of each scientist built

upon the work and knowledge of the upon the work and knowledge of the previous scientist.previous scientist.

Which type of microscope – Which type of microscope – simple or compound – did simple or compound – did Leeuwenhoek make and use?Leeuwenhoek make and use? Leeuwenhoek made and used a Leeuwenhoek made and used a

simple microscope.simple microscope.

Development of the Cell Development of the Cell TheoryTheory

Even after Hooke viewed cork Even after Hooke viewed cork cells, scientists still did not cells, scientists still did not understand cells and their understand cells and their importance.importance.

How did Schleiden, Schwann, How did Schleiden, Schwann, and Virchow contribute to the and Virchow contribute to the understanding of cells?understanding of cells?1663

1674

1838

1839

1855

Hooke observes cork

Leeuwenhoek observes living organisms.

Schleiden concluded that all plants are made of cells.

Schwann concluded that all animals are made of cells.

Virchow proposed that all new cells are formed from existing cells.

Development of the Cell Development of the Cell TheoryTheory

What is the cell theory?What is the cell theory? The cell theory is a widely accepted The cell theory is a widely accepted

explanation of the relationship explanation of the relationship between cells and living things.between cells and living things.

The cell theory states the following:The cell theory states the following: All living things are composed of cells.All living things are composed of cells. Cells are the basic units of structure Cells are the basic units of structure

and function in living things.and function in living things. All cells are produced from other cells.All cells are produced from other cells.

Development of Cell Development of Cell TheoryTheory

Why do you think it took almost Why do you think it took almost 200 years after cells were 200 years after cells were discovered for scientists to discovered for scientists to conclude that all living things conclude that all living things consist of cells?consist of cells?

Figure 3: Where do the cells of Figure 3: Where do the cells of the caterpillar and leaf come the caterpillar and leaf come from?from?

Scientists Song (Tune of Scientists Song (Tune of Bingo)Bingo)

A scientist named Robert Hooke looked A scientist named Robert Hooke looked under a microscope. In 1663, he under a microscope. In 1663, he looked at a slice of cork. He saw many looked at a slice of cork. He saw many tiny rooms and he called them cells!tiny rooms and he called them cells!

A guy named Anton van Leeuwenhoek A guy named Anton van Leeuwenhoek built simple microscopes. Drops of lake built simple microscopes. Drops of lake water, scrapings from teeth and gums, water, scrapings from teeth and gums, water from rain gutters. He saw water from rain gutters. He saw “animalcules”!“animalcules”!

Scientists Song (Tune of Scientists Song (Tune of Bingo)Bingo)

Almost 200 years later, three scientists Almost 200 years later, three scientists kept working. First there was Schleiden kept working. First there was Schleiden who said that all plants have cells.who said that all plants have cells.

Schwann said, “So do animals!”Schwann said, “So do animals!” All living things have cells.All living things have cells. Last came Rudolf Virchow who made a Last came Rudolf Virchow who made a

great conclusion. He said that all cells great conclusion. He said that all cells come from existing cells.come from existing cells.

These three guys helped the world These three guys helped the world discover cell theory!discover cell theory!

Scientists Song (Tune of Scientists Song (Tune of Bingo)Bingo)

Short VersionShort Version Robert Hook observed some cork.Robert Hook observed some cork. Leeuwenhoek looked at living Leeuwenhoek looked at living

things.things. Shleiden said, “All plants have cells.”Shleiden said, “All plants have cells.” Schwann said, “Animals too!”Schwann said, “Animals too!” Virchow wrote, All cells come from Virchow wrote, All cells come from

other cells.other cells.

Unicellular and Unicellular and MulticellularMulticellular

Is the actual dog larger or smaller Is the actual dog larger or smaller than the picture?than the picture?

Are the bacteria larger or smaller Are the bacteria larger or smaller than the picture?than the picture?

Unicellular and Unicellular and MulticellularMulticellular

What is a tissue?What is a tissue? A group of similar cells that work A group of similar cells that work

together to perform a specific together to perform a specific functionfunction

What are different types of What are different types of tissues working together tissues working together called?called? An organAn organ

Unicellular and Unicellular and MulticellularMulticellular

What is an organ system?What is an organ system?A group of organs that work A group of organs that work

together to perform a major together to perform a major functionfunction

Do bacteria have organs?Do bacteria have organs?No; they are unicellular and No; they are unicellular and

organs contain many cells.organs contain many cells.Many Celled Unicellular

Awards CeremonyAwards Ceremony

In groups of five, present a speech for In groups of five, present a speech for a scientist you are giving an award to.a scientist you are giving an award to. Speeches must be 15-30 seconds long.Speeches must be 15-30 seconds long. Must include the scientists name and why Must include the scientists name and why

he is getting an award.he is getting an award. All members of your group must give part All members of your group must give part

of the speech.of the speech.

You have 5 minutes to create and practice You have 5 minutes to create and practice your presentation.your presentation.

HomeworkHomework

Workbook PageWorkbook Page Sing the Scientist Song - LOTSSing the Scientist Song - LOTS Review Chapter 3 Section 1Review Chapter 3 Section 1

The warm ups next class will be about The warm ups next class will be about this section.this section.