WARM UP: Tues, Oct 1 In your 3 brad folder: Define homeostasis in your own words. (Hint: look in...
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Transcript of WARM UP: Tues, Oct 1 In your 3 brad folder: Define homeostasis in your own words. (Hint: look in...
![Page 1: WARM UP: Tues, Oct 1 In your 3 brad folder: Define homeostasis in your own words. (Hint: look in cell theory notes)](https://reader036.fdocuments.us/reader036/viewer/2022062519/56649edb5503460f94bebb38/html5/thumbnails/1.jpg)
WARM UP: Tues, Oct 1
• In your 3 brad folder:
• Define homeostasis in your own words.
(Hint: look in cell theory notes)
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Cellular Processes
Day 1
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Objectives
1. Define homeostasis.
2. Describe the Fluid Mosaic Model.
3. List items that enter & exit the cell .
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Homeostasis
= ability to maintain internal equilibrium– Maintain = keep– Internal = inside– Equilibrium = stable or balanced
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Why is maintaining homeostasis in our body & cells important?
An imbalance = disease or death!
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Cell Membrane• Function: 1) Regulates what enters & exits cell
2) Provides protection & support
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Cell Membrane AKAs• AKA: Plasma Membrane• AKA: Phospholipid Bilayer• AKA: Fluid Mosaic Model
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Fluid Mosaic Model
• Fluid = not solid, membrane moves• Mosaic = made of many parts
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Parts of a Plasma Membrane• Different Macromolecules in membrane:
1) Lipids = create bi-layer
2) Protein = create channel to pass large items
3) Carbohydrate Chains = identifying markers
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A Closer Look at the Cell Membrane
Phosphate head
Fatty Tails
Lipid Bi-Layer = 2 layers
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Phospholipid Bilayer
Latin Root: Bi = 2
• Phospholipid = hydrophilic head + hydrophobic tail BILAYER
• Hydrophilic = water loving• Hydrophobic = water fearing• Water & Oil do not mix
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What Enters?
• What the cell needs for survival1) Nutrients
2)
3)
4)
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What Exits?
• What the cell needs to remove for survival (wastes)1) Carbon Dioxide
2)
3)
4)
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Membranes
1) Permeable = anything can cross
2) Impermeable = nothing can cross
3) Selectively Permeable = some substances can cross, but not others
***Most membranes are selective***
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Phospholipid Bilayer and maintaining homeostasis
• Keep Balance = membrane selectively permeable
NO ENTRYENTER
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Egg Lab: Day 1
Paste chart into notebook
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WARM UP: Wed, Oct 2
• In your 3 brad folder:
• What is the difference between a permeable and impermeable membrane?
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Cellular Processes
Day 2
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Objectives
1. Define diffusion & osmosis.
2. Explain the 3 types of osmosis.
3. Define osmotic pressure.
4. Predict the results of an osmotic lab experiment.
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How “things” get selected to come into and out of the cell…
DIFFUSION
OSMOSIS
ACTIVE TRANSPORT
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DIFFUSION
= movement of particles from high to low
- Goes w/ the crowd - w/ the concentration gradient
• Does NOT require energy • Diffusion stops when 2
areas are EQUAL (homeostasis)
Low High
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Facilitated Diffusion
= movement larger molecules w/ “help” from protein channels• Does NOT require energy
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OSMOSIS = diffusion (movement) of water
- From high to low- W/ the crowd- Does NOT require energy
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Solvent & Solute
• Solvent = the liquid portion– i.e. the water in a salt water
mixture• Solute = the part that is
mixed in– i.e. the salt in a salt water
mixture
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3 Types of Osmosis
1) Hypertonic Solution = > (greater) concentration of solute outside the cell than inside
- Cell Shrink
Latin root: Hyper = over, more, higher
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3 Types of Osmosis
2) Hypotonic Solution = < (lower) concentration of solute outside the cell than inside
- Cell Burst
Latin root: Hypo = under, less, lower
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3 Types of Osmosis
3) Isotonic Solution = concentration solute outside = concentration inside
- Cell stays the same
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Osmotic Pressure
= pressure exerted on a cell membrane due to concentration gradient
= different conc. on either side of the cell membrane
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Egg Lab: Day 2
Answer questions 1-2 in complete sentence
Hypothesis Day 2: “ I believe…”
- Will the syrup level go up or down?
- Will the egg get larger or smaller?
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WARM UP: Thurs, Oct 3
• In your 3 brad folder:
• What is the difference between a hypertonic solution & a hypotonic solution?
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Cellular Processes
Day 3
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Objectives
1. Define active transport.
2. List the types of active transport.
3. Define concentration.
4. Predict the results of an osmotic lab experiment.
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Active Transport
= movement of molecules against the concentration gradient
***Low to High***– Against the crowd– REQUIRES energy– ATP = energy in cell
ATPRequiresEnergy
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Endosytosis
= take materials into cell
Latin root: endo = inner
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Endosytosis• Type 1:
Phagosytosis= engulf and ingest
particles
= “cell eating”- EX: white blood
cells eating invading bacteria cells
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• Type 2: Pinocytosis= ingest extracellular
fluid & its contents
= “cell drinking”– EX: human egg cells
drinking nutrients from surrounding cells while maturing in ovary
Endosytosis
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Exosytosis= cell releases materials to the outside
- discharge as membrane-bounded vesicles
- pass through the cell membrane
= “out of the cell”
Latin root: Ex = outer, away from
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Solution & Concentration
Solution = mixture 2+ substancesConcentration = amount of substance
(solute) in liquid (solvent)
– Cytoplasm = one concentration– Outside of cell = another concentration*** Want balance (homeostasis)***
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Concentration • Concentration gradient = unequal
distribution on either side of a membrane
• Equilibrium = concentration same n both sides of cell
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Egg Lab: Day 3
Answer questions 3-7 in complete sentences
Hypothesis Day 3: “I believe…”- Will the water level go up or down?- Will the egg get larger or smaller?
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WARM UP: Fri, Oct 4
• In your 3 brad folder:
• Define the term equilibrium
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Egg Lab: Day 4
- Answer questions 8-12 in complete sentences
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Friday, Oct 4
• Periods 1, 2, & 5 = Cell Process worksheets
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WARM UP: Mon, Oct 7
• In your 3 brad folder:
• What are the 3 macromolecules found in the plasma membrane?
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Cellular Processes
Day 4
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Objectives
1. Describe the difference between positive (+) and negative (-) feedback.
2. Predict the results of an osmotic lab experiment.
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Feedback Mechanism
= loop system in which system responds in either:
1) same direction (positive feedback)
2) opposite direction (negative feedback)
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Feedback Mechanism
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Feedback Mechanisms
• Channels = allows larger particles to come in. (Gate/Door)
• Receptors = signal (Intercom) • Markers = identify the type of cell
(ID Badge)
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Positive Feedback
= results in amplification or growth of output signal
• Ex: If you eat a McDouble at McDonalds, a hormone is released to your brain to signal satiation. You will feel the same “happiness” each time you eat the hamburger.
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Negative Feedback
= results in system responding in the opposite direction
• EX: Regulation of blood glucose levels. – Blood glucose levels continue to rise – May result in diabetes
• EX: Sweating
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Avid Thinking Strategy
• Map News!
Title of News Article or Topic
How does thisAffect me? Name of
SourceDate
Science Fact
ConclusionCluesEvidence
New Vocabulary
Branch ofScience
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WARM UP: Tues, Oct 8
• In your 3 brad folder:
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Tues, Oct 8
Latin Roots Quiz
& Osmosis/Diffusion Worksheets
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Latin Roots Quiz
1. Bi = ______ 6. Macro = _____
2. Mono = _____ 7. Endo = ______
3. Bio = ______ 8. Hypo = ______
4. Poly = ______ 9. Hyper = _____
5. Di = ________ 10. Ex = _______
Bonus: Cyto = ______
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WARM UP: Wed, Oct 9
• In your 3 brad folder:
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Wed, Oct 9
Stations Review
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WARM UP: Thurs, Oct 10
• In your 3 brad folder:
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Thurs, Oct 10
Gems of Wisdom
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WARM UP: Fri, Oct 11
• In your 3 brad folder:
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Fri, Oct 11
Test