Cell Physiology Flashcards
Cells reproduce by division except
Neurons do no t reproduce
General characteristics of cell
Every cell:
- needs nutrition
- get rid of toxic waste
- maintain their medium
- males emery fir t growth repair and other activities
- response
- reproduction
The Primary Tissues
CMEN
Types of organ
Parenchymal
Hollow
What is a plasmalemma
The cell membrane
Thickness of the cell membrane
75 to 111A
Cell membrane is composed of ______ substances.
They are:
Three
- protein (55%)
- lipids (40%)
- carbohydrates(5%)
On the basis of structure, cell membrane is called
unit membrane or a three-layered membrane.
Layers of the cell membrane
Two electron dense areas
A middle Electron lucent area
First proposed model of the cell membrane
Danielli-Davson model - sandwich of lipids
The fluid mosaic model was discovered by
SJ Singer and GL Nicholson
Major lipids in cell membrane
- Phospholipids
- Cholesterol.
Example off phospholipids
Aminophospholipids, sphingomyelins, phosphatidylcholine, phosphatidyletholamine, phosphatidylglycerol, phosphatidylserine and phosphatidylinositol.
Water soluble substances
glucose, urea and electrolytes
Types of proteins of cell membrane
- integral or transmembrane proteins
- peripheral proteins
Types of integral proteins
i. Cell adhesion proteins
ii. Cell junction proteins
iii. Some carrier (transport) proteins
iv. Channel proteins
v. Some hormone receptors
vi. Antigens
vii. Some enzymes.
Examples of peripheral proteins
i. Proteins of cytoskeleton
ii. Some carrier (transport) proteins
iii. Some enzymes.
thin and loose covering over the entire surface of the cell membrane
Glycocalyx
