1. Multicellular Organization
Section 7.4 – Homeostasis and Cells

2. Place the following terms in order: Simplest  Most Complex
Word
Paragraph
Letter (A, B, C,…)
Chapter
Book
Sentence

3. Unicellular vs. Multicellular:
In unicellular organisms (prokaryotes & eukaryotes), one cell carries out all of the functions of life.
Most cells of multicellular organisms are specialized to perform one or a few functions so they depend on the other cells for survival.
Both unicellular and multicellular need to maintain homeostasis
animal-like protist
plant-like protist

4. Place the following terms in order: Simplest  Most Complex
Organ
Tissue
Organism
Cell
Organ System

5. Multicellular Organization:

6. We are all made of cells
Organ
System
Organs
Tissues
Cells

7. Cells: Basic unit of structure and function in living things.
Cells with a specific structure and function and are found in multi-celled organisms.
Examples: skin cells, blood cells, brain cells, bone cells, liver cell, nerve cells, muscle cells, etc.
Brain cells
Blood cells
Liver cells

8. Tissues: Group of similar cells that carry out a specific function.
Examples:
epithelium
connective
muscle
nervous

9. Tissues:

10. Tissues Continued:
Epithelium – sheets of closely packed cells that cover surfaces
Connective – loosely scattered cells to support and link together other tissues
Muscle – pull against one another
Nervous – transmitting messages rapidly

11. Organs:
Several types of tissues that interact to perform a specific function.
Examples: stomach, kidney, liver

12. Organs Continued:
The stomach has muscular, epithelial, connective, and nervous tissue.
All but the simplest animals have organs.

13. Organ Systems:
Groups of organs that work together to perform a set of related tasks.
Examples: digestive, respiratory, circulatory

14. Organ Systems

15. Organ Systems Continued:
Mouth, esophagus, stomach, and intestines make up the digestive system.
Each organ performs a specific function in food digestion.
Organ systems interact with other systems like the respiratory system which supplies oxygen to cells to digest food.