CELL MEMBRANE STRUCTURE AND FUNCTIONS By. Dr Nazish.

Slides:



Advertisements
Similar presentations
Plasma Membrane.
Advertisements

The Cell Membrane. What is the cell membrane? AKA: Plasma membrane AKA: Plasma membrane The boundary between the cell and the environment The boundary.
I. The Cell (aka Plasma) Membrane Overview  Cell membrane separates living cell from nonliving surroundings  Controls traffic in & out of the cell.
AP Biology Catalyst  Which of the following choices lists the Organization of Life in order of increasing complexity?  Organism  Organs  Organ Systems.
AP Biology The Cell Membrane AP Biology Overview  Cell membrane ____________________living cell from nonliving surroundings  thin barrier.
Physiology -I PHL 215 PHL 215 Dr/ Gamal Gabr Pharmacy College Pharmacy College 1.
The Cell (aka Plasma) Membrane intro mini-movie intro mini-movie.
Cell Membranes. Cell membrane Also known as the PLASMA MEMBRANE.
Cell Membrane. Function of Cell Membrane  Separates the cell’s contents from materials outside the cell  Regulates what moves in and out of a cell 
The Cell Membrane 1 Cell membranes are composed of two phospholipid layers called a phosholipid bilayer. The cell membrane has two major functions: 1.
AP Biology The Cell Membrane AP Biology Membrane Function  Outer plasma membrane  Forms a boundary between a living cell and its surroundings.
Cell Membrane. Cellular membranes are fluid mosaics of lipids and proteins Phospholipids are the most abundant lipid in the plasma membrane (fluid portion.
The Plasma (Cell) Membrane. Plasma Membrane Maintaining Balance Separates living cell from nonliving environment Allows flow of nutrients into and out.
Membranes in cells Membrane structure and function Lecture 21.
Plasma Membrane. Cell Membrane 1. What is the special lipid found in the plasma membrane? 2. What do you think makes up the plasma membrane?
The Cell Membrane What does the cell membrane do? Separates living cell from aqueous environment Controls traffic in & out of the cell –allows.
The Cell Membrane. What is the cell membrane? AKA: Plasma membrane The boundary between the cell and the environment Does every cell have a cell membrane?
Membrane Structure and Function. What is the Function of The Plasma Membrane? Boundary Must be selectively permeable.
AP Biology The Cell Membrane AP Biology Overview  Cell membrane separates living cell from nonliving surroundings  thin barrier = 8nm thick.
CELL MEMBRANE: FLUID MOSAIC. CELL/ PLASMA MEMBRANE Separates the inside of the cell from its environment Receives messages from outside Allows things.
AP Biology The Cell Membrane AP Biology Overview  The cell membrane separates the inside of a living cell from its surroundings  Function to maintain.
Cell Membranes.
Date: November 18, 2015 Aim #27: How does the structure of the cell membrane contribute to its function? HW: 1) Quiz next Tuesday 11/24 and Wednesday 11/25.
The Cell Membrane. What is the cell membrane? AKA: Plasma membrane The boundary between the cell and the environment Does every cell have a cell membrane?
Phospholipid A phospholipid is a type of lipid used in the cells of living things.
Learning Goal: Identify the major components of a cell membrane.
The Structure of the Plasma Membrane. Membrane Structure The plasma membrane is 8 nm thick. It is mainly made up of phospholipids and proteins.
The Cell Membrane Phospholipids Phosphate head hydrophilic Fatty acid tails hydrophobic Arranged as a bilayer “repelled by water” “attracted to water”
Phospholipid Bilayer. The Cell Membrane a phospholipid bilayer.
What is the cell membrane? AKA: Plasma membrane The boundary between the cell and the environment Does every cell have a cell membrane? Yes!, Each and.
The Cell Membrane. What is the cell membrane? AKA: Plasma membrane The boundary between the cell and the environment Does every cell have a cell membrane?
The fluid-mosaic model of membrane structure
The Cell Membrane Phospholipids Fatty acid Phosphate Phosphate head – hydrophilic Fatty acid tails – hydrophobic Arranged as a bilayer “repelled.
Plasma Membrane  Responsible for homeostasis. Plasma membrane Thin, flexible boundary between a cell and its environment. Allows nutrients in and allows.
HOMEOSTASIS and the PLASMA MEMBRANE Carroll. Objectives Explain the function of the plasma membrane. Relate the function of the plasma membrane to the.
The Cell Membrane. I.) What is the cell membrane? A. AKA: Plasma membrane B. The boundary between the cell and the environment C. Does every cell have.
The Plasma Membrane (Cell Membrane) The Fluid Mosaic Model.
The Cell Membrane Bell-ringer : Make a list of anything you know about the plasma membrane.
The Cell Membrane Biology Honors.
The Cell (Plasma) Membrane
Warm Up for 10/4: In a sentence or two, explain why the oil can’t “mix” with the water molecules.
Structure of the plasma membrane
The Phospholipid Bilayer aka The Cell Membrane 
The Cell Membrane.
Cell Membranes.
Cell Membrane.
The Cell Membrane
The Cell Membrane
The Cell Membrane.
The Cell Membrane.
The Cell Membrane.
The Cell Membrane.
Fluid Mosaic Model of the Cell Membrane
Biology & Biology Honors
The Plasma Membrane (Cell Membrane)
CELL (PLASMA) MEMBRANE
Diffusion, Osmosis, and Cell Membrane
The Cell Membrane.
Learning Goal: Identify the major components of a cell membrane.
Cell Membrane Honors Biology.
Topic 3 Cell Membrane.
Cell Membrane Structure
Traffic control in cells… Who’s the man (or woman)??
Cell Membrane Structure
CELL (PLASMA) MEMBRANE
The Cell Membrane 3.3 E.Q.: How is the structure of the cell membrane important for its function?
The Plasma Membrane.
Cell Membrane notes.
Cell Membrane The Fluid Mosaic Model.
The Cell Membrane.
Presentation transcript:

CELL MEMBRANE STRUCTURE AND FUNCTIONS By. Dr Nazish

Learning Objectives 1. The bilayer structure of plasma membrane 2. Types of lipids in the membrane: physiological significance 3. Physiological importance of proteins in the plasma membrane 4. Types of carbohydrates: physiological importance 5. Selective permeability characteristics of the plasma membrane.

Lipid bilayer Intracellular fluid Extracellular fluid

Choline Phosphate Glycerol Fatty acid Head (polar, hydrophilic) Tails (nonpolar, hydrophobic) - = Negative charge on phosphate group - Lipid bilayer is phospholipids

Lipid bilayer ICF (water) ECF (water) Polar heads (hydrophilic) Nonpolar tails (hydrophobic) Polar heads (hydrophilic) Phospholipids form a bilayer That has a hydrophobic interior. This interior is sandwiched between hydrophilic inner and outer surfaces.

Functions of the lipid bilayer Cholesterol : allows the membrane to be fluid. - Forms the basic structure of the membrane. - Hydrophobic interior is a barrier to water- soluble substances - allows diffusion of fat soluble substances

Extracellular fluid Lipid bilayer Intracellular fluid Dark line Light space Appearance using an electron microscope Dark line Glycoprotein Glycolipid Carbohydrate chain Channel Various membrane proteins Cholesterol molecule Phospholipid molecule

Functions of plasma membrane Channel proteins

Functions of membrane proteins Carrier proteins

Functions of plasma membrane Receptor proteins

Functions of plasma membrane Docking marker acceptors

Functions of plasma membrane cell adhesion molecules

Functions of cell membrane Self identification markers

Membrane- bound enzymes ReceptorCarrier molecules molecules Functions of membrane proteins Channels Channels Docking- marker acceptors Cell adhesion molecules Cell identity markers

Channels: span the membrane as water-filled pores Carrier molecules Receptor sites: proteins that bind with specific molecules Docking-marker acceptors (on inner surface for secretory vesicles) Filamentous meshwork (cytoskeleton) Membrane-bound enzymes Cell adhesion molecules : protrude from surface Cell identity markers in conjunction with carbohydrates Functions of membrane proteins.

CHO containing Surface markers involved in tissue growth. Cell identity markers in conjunction with proteins Functions of membrane carbohydrates.

THANK YOU AND HAVE A NICE DAY

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.