We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published byEzequiel Coppage
Modified over 2 years ago
Structure (Plasma Membrane) A lipid bilayer(2 layers of lipids) with a variety of proteins
Lipid molecule Proteins
Identify the lipid molecules. Identify the protein molecules. What is a ‘lipid bilayer’?
Function - To be Selective Permeable: = control what passes in or out of the cell (Plasma Membrane) -Helps maintain Homeostasis: = maintain a stable internal environment
- Act as a lining, separates the chemicals of the cytoplasm from the surroundings What the lipids do…
(Plasma Membrane). 1. Form a. open channels b. gated channels c. active transport pathways, All to move molecules in & out of the cell! What the proteins do…
Open channels Ex. 1 of channel proteins.
Gated channel Ex. 2 of channel proteins.
(Plasma Membrane) - - Receptors that change cellular activity. Protein Function #2
Receptor protein Signal molecule
Change cellular activity
(Plasma Membrane) - - Create a molecular mark (signature) that identifies that specific, individual cell. Protein Function #3
Types of particle that might cross membranes. Tiny molecules, like… Water Oxygen & Carbon dioxide
Types of particle that might cross membranes. Small molecules, like… Glucose, amino acids, fatty acids and glycerol
Water Carbon Dioxide Oxygen Aminoacid Glycerol Glucose Fatty Acid
Yet more types of particles that might cross cell membranes! Yes, even large molecules, such as… Polysaccharides Lipids & proteins!
Lipid soluble molecules Fats, Fatty acids
Charged particles ions Na+, K +, Cl +
Even Large Particles may sometimes cross the selectively permeable cell membrane! Such as… small organisms and Organic debris
Diffusion Movement of particles from an area of high concentration to an area of lower concentration.
Diffusion requires a Diffusion requires a Concentration gradient When the concentration of particles is not the same throughout a mixture.
Concentration Gradient There is a region of high concentration and a region of low concentration.
Go to page 7 in the note packet and learn about the use of square brackets. [ ]
Do the activity The Tea Cup & The Swimming Pool on page 8.
Equilibrium When the concentration of particles is the same throughout a mixture.
Equilibrium There is no region of high, nor a region of low concentration of particles.
Equilibrium All particle continue to move.
TRANSPORT The Movement of Materials Across Membranes
Passive Transport Materials move down the concentration gradient and across a membrane.
What determines if a particle can go through a channel?
Osmosis The passive transport of water across a membrane.
Thistle Tube Demo
water molasses thistle tube Selectively permeable membrane
Active Transport Particles move Across a SPM. theAgainst the concentration gradient. The cells must spend energy.
Active transport allows particles to move against the concentration gradient. (from an area of _____ concentration to an area of ___ concentration) HIGH LOW
An example of Active Transport: All animal cells have a Sodium Potassium pump that pumps sodium (Na +) to the outside of cells and potassium (K +) to the inside of cells.
This ‘pump’ allows nerve cells to carry electrical messages through the body! Nerve cell
The Cell Membrane of a nerve cell
Endocytosis Particles move INTO the cell by folding a portion of the membrane around a particle, resulting in a vesicle.
There are two types of Endocytosis: Pinocytosis - drinking Dissolved materials Phagocytosis - eating Food particles
Pinocytosis The solute particles are too small to see but too big to pass through the membrane.
Exocytosis Particles move OUT OF a cell by fusing vesicles with the cell membrane.
Maintaining water balance in Protists
Facilitated Transport (Facilitated Diffusion) -Diffusion using protein channels
1 The Plasma Membrane The Plasma Membrane - Gateway to the Cell.
Chapter 5 A Closer Look At Plasma Membranes Chapter 5 A Closer Look At Plasma Membranes Honors Biology.
CP BIO: Ch. 7 The Cell Membrane and transport across the membrane.
How do cells maintain balance? Cells need to maintain a balance by controlling material that move in & out of the cell HOMEOSTASIS.
1 The Plasma Membrane The Plasma Membrane - Gateway to the Cell copyright cmassengale.
Cell Boundaries All cells are surrounded by a thin, flexible barrier known as the cell membrane. Many cells also produce a strong supporting layer around.
The process of achieving a relatively stable internal environment CELLS MUST CONSTANTLY RESPOND TO NATURAL FORCES IN THEIR ENVIRONMENT IN ORDER TO MAINTAIN.
Cell Membrane & Cellular Transport Homeostasis – the maintenance of internal stable conditions The cell membrane keeps the cell in balance.
Biology AHSGE Standard II- Cell Processes. Biology AHSGE Standard 2. Describe cell processes necessary for achieving homeostasis, including active and.
Chapter 7: Cells and Their Environment. Cell Membrane 1. Function Selectively (semi-) permeable a. Some substances can pass through but others cannot.
2.4.4: Define diffusion and osmosis Diffusion: The passive movement of particles from a region of high concentration to a region of low concentration until.
Homeostasis depends in part on appropriate movement of materials across the cell membrane. Homeostasis refers to the necessity of an organism to maintain.
1 Gateway to the Cell. 2 Protective barrier Regulate transport in & out of cell (selectively permeable) Regulate transport in & out of cell (selectively.
Cell Membrane, Transport, Enzymes, & Energy Unit 4 Review.
Cell Transport Semipermeable membrane – small, lipid-soluble particles can pass, but large, charged particles cannot Diffusion – net movement of particles.
Cellular Transport. Type 1 Do a quick type 1 collins and tell me everything you know about plasma membranes (3ish minutes). Sentences are not necessary!
Science AHSGE Standard V-1, Part 2- Cell Processes.
Cells and Their Environment Chapter Passive Transport Part 1: Diffusion Remember: Living things need to maintain homeostasis (responds to external.
PHOSPHOLIPIDS … Hydrophilic molecules are attracted to water. Hydrophobic molecules are not attracted to water but to each other. Phospholipid molecules.
Cellular Transport How cells interact with the outside world Chapter 7-3 Pgs
MOVING MATERIALS INTO AND OUT OF CELLS. MATERIAL MOVEMENT PASSIVE TRANSPORT ACTIVE TRANSPORT.
Cell Transport Study Guide. 1. Which forms of transport do NOT require energy? Diffusion Osmosis Facilitated Diffusion *All of these are passive!
Cellular Transport. Review of Diffusion Movement of particles from an area of higher concentration to an area of lower concentration.
Westside High School 9 th Grade Biology Crossing the Plasma Membrane.
Membrane Structure and Function Chs. 8 and 11. Cell Membrane – Introduction Separates the living cell from its nonliving surroundings 8 nm thick Controls.
End Show Slide 1 of 47 Copyright Pearson Prentice Hall Biology.
Chapter 5 continued Section 5.3: Plasma Membrane Permeability Section 5.4: Modification of Cell Surfaces.
Cellular Transport Fact: Particles of matter are always in motion no matter what state this random motion helps explain how materials enter and exit the.
Section 3-3, 3-4, 3-5 Movement across the c ell membrane Write everything that is underlined.
Question of the Day 1. Homeostasis = ??? 2. What kind of solution can cause a cell to burst (explode)? isotonic, hypotonic, or hypertonic? 3. Water crosses.
© 2016 SlidePlayer.com Inc. All rights reserved.