PLASMA MEMBRANE
&
ITS MODEL
Presented by: TAUHEED KHAN
SAJID KHAN
Dr . RAJYASHREE YEWALE
DEPT OF ZOOLOGY
JIJAMATA MAHAVIDYALAYA BULDHANA
,Introduction
Definition of the Plasma Membrane
Biological membrane that separates the cell interior from the
outside environment
Selectively permeable barrier
Composed mainly of a lipid bilayer
Contains embedded proteins and carbohydrates
Key roles: protection, communication, transport, and
maintaining homeostasis
, History
History of the Plasma Membrane
Early Discoveries (1800s)
• First observed with early microscopes.
• 1895: Ernest Overton suggested membranes are made of lipids.
Lipid Bilayer Hypothesis (1925)
• Gorter and Grendel proposed the membrane is a double layer of
lipids.
Danielli-Davson Model (1935)
• Suggested membranes have a lipid bilayer coated with proteins.
Modern Understanding (1980s-Present)
• Advanced microscopes revealed detailed structure and function of
membranes.
&
ITS MODEL
Presented by: TAUHEED KHAN
SAJID KHAN
Dr . RAJYASHREE YEWALE
DEPT OF ZOOLOGY
JIJAMATA MAHAVIDYALAYA BULDHANA
,Introduction
Definition of the Plasma Membrane
Biological membrane that separates the cell interior from the
outside environment
Selectively permeable barrier
Composed mainly of a lipid bilayer
Contains embedded proteins and carbohydrates
Key roles: protection, communication, transport, and
maintaining homeostasis
, History
History of the Plasma Membrane
Early Discoveries (1800s)
• First observed with early microscopes.
• 1895: Ernest Overton suggested membranes are made of lipids.
Lipid Bilayer Hypothesis (1925)
• Gorter and Grendel proposed the membrane is a double layer of
lipids.
Danielli-Davson Model (1935)
• Suggested membranes have a lipid bilayer coated with proteins.
Modern Understanding (1980s-Present)
• Advanced microscopes revealed detailed structure and function of
membranes.
