Homeostasis and Cell Transport 5.1 Passive Transport 5.2 Active Transport.
Transport-cell membrane Do Now : What is homeostasis? What is transport? Brainstorm : Can you...
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Transcript of Transport-cell membrane Do Now : What is homeostasis? What is transport? Brainstorm : Can you...
![Page 1: Transport-cell membrane Do Now : What is homeostasis? What is transport? Brainstorm : Can you brainstorm one way that transport helps to maintain homeostasis.](https://reader036.fdocuments.us/reader036/viewer/2022062517/56649edb5503460f94beba8f/html5/thumbnails/1.jpg)
Transport-cell membrane
• Do Now:
• What is homeostasis?
• What is transport?
• Brainstorm:
• Can you brainstorm one way that transport helps to maintain homeostasis in your body? (explain)
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Definitions…..
• TRANSPORT• -absorption,
distribution, circulation, cyclosis, osmosis, diffusion
• HOMEOSTASIS• -maintaining a stable
internal environment
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What does venom have to do with cell membranes?
• Brown Recluse Spider Bite!
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Western Diamondback Rattlesnake bite!
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Vocabulary
• Solution- mixture in which one or more substances are UNIFORMLY distributed in another. “homogenous solution”
• Solute- what gets dissolved.• Solvent- what does the dissolving.• Ex- salt water- salt is solute, water is
solvent. Ice tea- mix=solute, water=solvent
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Why is the cell membrane so important???
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Names!
• Cell membrane
• Plasma membrane
• Selectively permeable membrane
• Semi permeable membrane
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Honors Know diagram on pg 82!
• Variety of Proteins:
• I. Glycoproteinsa) Receptor protein
b) Recognition proteins
c) Enzymatic proteins
d) Attachment proteins
e) Transport proteins
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Functions of the Cell Membrane
• Protects the cell
• Regulates what goes in and out of cell
• Helps to communicate with other cells
• Creates attachments between cells
• Dynamic!
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Fluid Mosaic Modeldev. By Singer & Nicolson 1972• Proteins move within layers of lipids w/I viscous
fluid• Hydrogen bonds can form between water and
phospholipid heads inside and outside of cell• The more double bonds there are in the tails the
more fluid the membrane• Incr. in temp. causes membr. To be more fluid
(because mol. Move faster)• Decr. Temp. (mol. Move slower -> less fluid)
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Active & Passive Transport
IllustrationsChapter 5 Lab Biology
Chapter 5 Honors Biology
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Passive Transport
•Requires NO energy!!
•Movement from a high concentration to a low concentration!
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Passive Transport
• 1. diffusion
• 2. osmosis
• 3. facilitated diffusion
• 4. diffusion through ion channels
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Diffusion
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Diffusion
• Molecules moving from a greater concentration to a lower concentration
• Ex: perfume
• Simple diffusion: Oxygen, Carbon Dioxide, water and lipid soluble molecules
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Vocabulary
• Concentration gradient: difference in concentrations (amount of solute)
• Equilibrium: particles/molecules are equal on both sides of membrane
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More diffusion -> “equilibrium”!!
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Osmosis
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Osmosis
•Movement of WATER from a high concentration to a low concentration across the cell membrane
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Iso – Hyper – Hypotonic Solutions
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Vocabulary
• Isotonic: concentration inside and outside of cell are the same no diffusion
• Hypertonic: when concentration of solute outside of cell is greater, water moves out of cell (shrink)
• Hypotonic: concentration of solute inside of cell is greater, water moves into cell (burst)
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Plasmolysis
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Plants!
• Plasmolysis = cell shrinks away from cell wall due to water loss ex: drought (low rain fall) causing plants to wilt
• Turgor Pressure = cell wall sustains shape, otherwise would explode
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Facilitated Diffusion
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Facilitated Diffusion• Carrier Protein –-protein recognizes substance->changes
shape->delivers substance to inside of the cell
• Facilitated Diffusion: water soluble molecules (hydrophillic). Ex: ions, amino acids (small proteins), and sugars
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Ion Channels
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Ion channels
• -allows ions Ca2+ and Cl- to enter cell
• Some are open all the time
• Others are gated and will open when– Cell membrane stretches– Electrical signals – Chemical signals
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Active Transport
•REQUIRES ENERGY!
•Movement from a LOW concentration to a HIGH concentation!
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Active Transport• 1. Sodium Potassium Pump
• 2. Endocytosis
• 3. Exocytosis
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Active Transport
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Sodium Potassium Pump
• -pumps like to keep ions in balance• 3 Na+ out for every 2 K+ in• This creates a build up of Na+ outside cell
and K+ inside cell forming a net electrical charge across the membrane
• Allows for nerve impulses• Contraction of muscles• 1/3 of all energy in animal cells goes to
running this pump even as we sleep!
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Endocytosis
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Endocytosis
• Take in external fluid, macromolecules and other large particles.
• Forms “vesicle” some fuse with lysosomes (digestion) others fuse with membrane of other organelles.
• 2 Types: a) pinocytosis – cell drinking fluid
• b) phagocytosis – cell eats
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Exocytosisopposite of endocytosis!!