Homeostasis & Transport Homeostasis Passive Transport Active Transport.
Transport in the Cell Active and Passive Transport.
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Transcript of Transport in the Cell Active and Passive Transport.
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Transport in the Cell
Active and Passive Transport
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How can molecules move through cells?
• Semi-permeable membrane: allows certain molecules to move in or out depending on their properties– Ex: if they are too big, they can’t go in
easily
• Membrane is made of (composition):– Bi-lipid layer
• 2 layers of lipids
– Proteins that transport materials across– Carbohydrates that act as identifiers
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Fluid Mosaic Model-membrane is a fluid with a bunch of different components
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Before we begin you must understand….
• Concentration-how much solute is in a solvent
• Why must molecules move?– To maintain homeostasis– Homeostasis-state of balance in
which the internal body remains in a normal range
– Molecules must move to maintain this
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Biology 11/5
HW-Concept Map
1.Take out 7.3 wkst and 7.3 notes.2.Pick up your binder in the back. Put 7.3 reading guide in wkst section.
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2 types of transport in the cell• Passive transport
– Molecules move down the concentration gradient• Area where there is
a lot of molecules to where there is very little
– Energy involved: NO• Active transport
– Molecules move up the concentration gradient• Area where there is
a few molecules to where there is a lot
– Energy involved: YES
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Movie Time
http://www.brainpop.com/science/matterandchemistry/diffusion/
Username: cvbrainpopPassword: cheetah1
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Type of Passive TransportDiffusion-movement of molecules
from an area of high concentration to an area of low concentration until equilibrium is reached – Equilibrium-equal distribution
• Molecules will move equally after this is reached.
– Simple molecules can move• Carbon dioxide, oxygen
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Passive transport
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Osmosis-Type of passive transport
• Water moves from an area of high concentration to an area of low concentration
– No energy involved– AKA: diffusion of water
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Hypertonic and Hypotonic• Hypotonic-More water outside the cell than
inside– Distilled water– Water comes into the cell – Why? To balance out the concentration of
solutes• Hypertonic-More water inside the cell than
outside– Salt water– Water leaves the cell– Why? to balance out the concentration of
solutes
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Isotonic
• Molecules are equal inside and outside the cell– Molecules move evenly across
the membrane
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Biology 11/14
HW-finish concept mapAgenda: Stations; finish notesYou should be:1.Take out 7.3 notes2.Take out paper with station information.
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Station Exploration• You will visit different stations.• At each station, there will be directions
telling you what conditions each item was place in or what to do with each item.
• On your paper, you need to write down a brief description of what you see and why.– Examples of answers for why: hypertonic,
hypotonic, diffusion, osmosis, decrease in turgor pressure, molecule movement
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Why is water so important to a plant?
• Water fills the vacuole and the contents of the cell are pushed against the cell wall
• Produces turgor pressure• Gives the plant rigidity and the
ability to stand erect
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Facilitated Diffusion-3rd type of passive transport
• Molecules move from an area of high concentration to an area of low concentration with the help of a carrier protein– Molecules attach to a specific protein– The protein allows it to move through the
membrane– Needed when molecules are too big or have
an electrical charge (ions!!)• Glucose (large molecules), Na+, Ca+, K+, Cl-
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Active Transport-A reminder!
•Requires energy from the cell
•Move molecules from an area of low concentration to high
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Endocytosis
•Process for bringing things into the cell
•Used for large particles (bigger than molecules, still microscopic)
•Requires energy
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Phagocytosis• “Cell Eating”
• Very large particles taken in by cell (engulfed)
• “Cell Drinking”• Small bits of
liquid or other substances taken in
Pinocytosis
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Exocytosis
•Process for moving large amount of material out a cell
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Movie Time
http://www.brainpop.com/science/cellularlifeandgenetics/activetransport/
Username: cvbrainpopPassword: cheetah1
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Bio 11/13
HW-finish wkst; Lab due Friday; test and flashcards Friday (25 from 7.3 and 10 from 7.4)
1. Turn in analysis questions. Put transport review in wkst section. This is a great study tool for the test. Put lab info in lab section.2. Take out 7.4 notes-we will finish this.
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Movie time
• http://www.brainpop.com/science/cellularlifeandgenetics/passivetransport/
Username: cvbrainpopPassword: cheetah1
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Section 7.4
• Unicellular-one celled– Bacteria, algae, yeast– One cell does all the work
• Multicellular-many celled– Plants, humans– Specialized cells do certain things
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Specialization• Cell develop differently to perform
different tasks• All cells at one time in your body are
the same (stem cells)– Then they differentiate in fetal
development• Become different cells with different functions• Muscle cells-allow movement• Red blood cells-carry oxygen• Guard cells in plants open and close stomata
on a leaf.
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Smallest level
Largest level
Group of similar cells
Group of tissues
Group of organsthat perform a specific function