Class notes
Chapter 3: Cells - The Living Units
- Course
- BIO 1301
- Institution
- University Of New Orleans
In this chapter you will be taking a deeping dive on cells in what there role is in the body.
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CEIIIS : TE LIVING UNITSSa
-
. I cells are the smallest unit of life
3
The cell is the smallest unit when you define the of cells you define the properties of life
I
properties ,
.
All organisms are made of one or more cells Cells are the structural and functional building
.
. Different cell types have different functions within an organism and the
blocks of an organism ,
activity of an organism depends on the activities of individual cells and of all of the cells together.
cells only arise from other cells
. Most body cells arise by mitosis ,
which we explore later in the
chapter .
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cell of reproduction
, A human cell has three main parts :
The boundary the cell which barrier.
plasma membrane : the outer of ,
acts as a
selectively permeable
The cytoplasm : the intracellular fluid packed with organelles ,
small structures that perform specific ce
functions
The organelle that controls cellular activities the nucleus lies near the cell's
nucleus : an
.
Typically
Center .
Extracellular Materials
Extracellular fluid internal fluid located outside cells includes interstitial fluid ,
,
blood plasma and ,
cerebrospinal fluid .
cellular secretions these secretions include substances that did in digestion and some that act a
lubricants (Saliva ,
mucus and serous
,
fluids)
Extracellular material
matrix most abundant extracellular . Nonliving material in connective tissu
consisting of ground substance and fibers ; separates the living cells .
Part 1 Plasma Membrane
plasma membrane separates two of the body's major fluid compartments the intracellular fluid -
within cells and the extracellular fluid outside . Its a membrane
cells composed of phospholipids
, ,
cholesterol and proteins that encloses , ,
cell contents ,
outer lining cell membrane
.
.2
3 The plasma membrane is a double
layer of phospholipids with embedded proteins
The fluid mosaic model is a
depiction of the structure of the membranes of a cell a
phospholipid
bilayers in which proteins are .
dispersed
Membrane Lipids
The lipid bilayer forms the basic "fabric" of the membrane It is constructed .
largely of
phospholipids ,
with smaller amounts of cholesterol
Phospholids have hydrophilic heads that are attracted to water the main constituent of
·
schematic plasma membrane
Cinclu des phosphate group) I extracellular fluid
acids) polar heads Nonpolar tails "hide"
face the water from the water
inside outside
the cell
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