Cells: Life in Balance I. Why does “Balance” matter?

• Consider for a moment the importance of a space suit for astronauts to walk in space. Without the space suit, or a barrier between an “internal” and “external” environment, the astronauts would die.

• Living organisms must maintain certain conditions in their bodies to stay alive. II. What is Homeostasis?

Definition:

Examples:

What one word summarizes what homeostasis really means? ______________

What is the primary unit of life? The cell is the primary unit of life. It isn’t just a bag of goo, it is an elaborate, efficient machine containing specialized parts that enable us to live.

III.Cell Theory:

1.

2.

3.

IV.Types of Cells: Cells are organized by how complex

they may be A. Prokaryotes:

B. Eukaryotes:

1.

Cells are like tiny organisms. Organisms are composed of organ systems, and those organ systems are composed of organs. Eukaryotic cells are composed of organelles, each of which has a specific job it needs to do to keep the cell alive.

Organelles: 1. Cell Membrane:

• Analogy =

a. AKA: b. Semi Permeable =

2. Nucleus:

1.Contains:

C. Analogy =

3. Ribosomes: There are hundreds of these round structures in each cell. They are responsible for manufacturing proteins. A. B. C. • Analogy =

4. Mitochondrion: A. B. • Analogy =

5. Endoplasmic Reticulum (ER):

A. Rough ER –

B. Smooth ER –

C. Analogy =

6. Golgi Apparatus:

• Analogy =

7. Centrioles:

• Analogy =

8. Cytoplasm:

A. Cytosol =

Analogy =

Plant cells contain the same organelles as animal cells, plus 3 specialized organelles:

a. Chloroplast:

A.

• Analogy =

b. Vacuole:

• Analogy =

c. Cell Wall:

• Analogy =

ANIMAL CELLL PLANT CELL