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BIOL 235 (Rev 12) Chapter 3 -- Cellular Level of Organization
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BIOL 235 (Rev 12) Chapter 3 -- Cellular Level of Organization
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BIOL 235 (REV 12) CHAPTER 3 --CELLULAR LEVEL OF ORGANIZATION
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REMINDER: CELLULAR level [6 levels of organization of the human body]
(Chapter 1.2) - CELLULAR Level:
- The second smallest structural organization among the six levels of organization of the human body.
**Analogy of language: words
- Cells are considered to be the smallest living units of the body and are composed of molecules that
combine together to make cells.
Define CELLS.
(Chapter 3.1 - Parts of a Cell) - Cells: "the basic, living, structural, and functional units of the body"
- Cells are the "smallest living units of the body"
REMINDER: What makes up a cell?(Chapter 1.2) - Cells are composed of molecules that combine
together.
Define CELL BIOLOGY.
(e.g., Cytology)
(Chapter 3.1) - Cell Biology (A.K.A., cytology):
"The scientific study of cells"
REMINDER: Define HOMEOSTASIS.(Chapter 1.4: Homeostasis) - Homeostasis: The state of being able to
maintain relatively stable conditions in the body's internal environment.
REMINDER: "Homeostasis is a ________________ condition"
,a) static
b) dynamic
(Ch. 1.4) - "Homeostasis is a DYNAMIC condition"
- Homeostasis in the human body is continually being disturbed and it is constantly changing to adapt in
response to system and changing conditions to maintain stability.In order to maintain a regulatory,
optimal, and stable internal environment, body tissues and organs are constantly adapting and
responding to the changes the system might experience.
"Cells carry out a multitude of functions that help each system contribute to the __________________
of the entire _____________. At the same time, all cells share key structures and functions that support
their intense activity."
Chapter 3 Introduction - "Cells carry out a multitude of functions that help each system contribute to the
HOMEOSTASIS of the entire BODY. At the same time, all cells share key structures and functions that
support their intense activity."
List the 3 Main Parts of a Human Cell?
(Chapter 3.1) - - Plasma Membrane
- Cytoplasm
- Nucleus
"The average adult human body consists of more than 100 _____________ cells."
a) Thousand
b) Million
c) Billion
d) Trillion
e) None of the above - we only have one hundred cells
Ch. 3.1 - Parts of a cell - "The average adult human body consists of more than 100 TRILLION cells."
Plasma Membrane is also known as:
a) Mucous membrane
, b) Unilateral membrane
c) Cell membrane
d) Nuclear envelope
(Chapter 3.1 - Figure 3.1) - c) Cell membrane
Plasma membrane = Cell membrane
Plasma membrane (e.g., Cell membrane)
Chapter 3.1 - Plasma Membrane/Cell Membrane:
- Membrane found in all cells that separates the interior of the cell from the outside environment
- Forms the cell's flexible outer surface, separating the cell's internal environment (everything inside the
cell) from the external environment (everything outside the cell).
- Selective barrier that regulates the flow of materials into and out of the cell
- Also has a key role in communication among cells and between cells and their external environment.
Fill-in-the-Blanks:
The plasma membrane/cell membrane separates the cell's ___________________ (everything
___________ the cell) from the ______________________ (everything ___________ the cell).
a) external environment; outside; surface area; on
b) internal environment; outside; external environment; outside
c) internal environment; inside; external environment; outside
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