Cellular Organization

Cellular Organization
Sec. 7-4
Interest Grabber
Section 7- 4
From Simple to More Complex
• Many multicellular organisms have
structures called organs that have a specific
function and work with other organs.
Working together, these organs carry out the
life processes of the entire organism.
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Interest Grabber continued
7- 4
• Section
1. Some
activities cannot be performed by
only one person, but need a team of
people. What type of activity requires a
team of people to work together in order to
complete a task?
• 2. What do you think are some
characteristics of a successful team?
• 3. How is a multicellular organism similar to
a successful team?
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Section Outline
Section 7- 4
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The Diversity of Cellular Life
– ALL cells use the same basic chemistry
– Cells are specialized, as individuals or as parts of
larger organisms
– Grow, respond, reproduce
A. Unicellular Organisms: Single celled
- Dominate life on Earth
- Prokaryotes
- Bacteria – adaptable
- Eukaryotes
- Algae, Yeast (unicellular fungi), and
B. Multicellular Organisms: Made up of
many cells that work together
- Interdependent (team)
- Cell specialization
C. Levels of Organization
1. Cells: Basic living units of ALL
2. Tissues: Group of similar cells that
perform a particular function
- 4 main types: muscle, epithelial
(cover or line body), nervous, and
connective (bone, blood, cartilage,
and lymph)
3.Organs: Many groups of tissues
working together
4.Organ Systems: Group of organs that work
together to perform a specific function
- 11 major organ systems: muscular,
skeletal, circulatory, nervous,
integumentary, respiratory, digestive,
excretory, endocrine, reproductive, and
Levels of Organization
Section 7- 4
Muscle cell
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Smooth muscle tissue
Digestive system
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