Homeostasis requires exchanging materials with the environment. How do you do it?
description
Transcript of Homeostasis requires exchanging materials with the environment. How do you do it?
![Page 1: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/1.jpg)
Homeostasis requires exchanging materials with
the environment.How do you do it?
Surfaces of contact with the environment let in oxygen and nutrients and excrete wastes.
![Page 2: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/2.jpg)
The surface of contact between a cell and its environment is its plasma membrane.
![Page 3: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/3.jpg)
Inside cell
Outside cell
Fluid Mosaic Model(description of membrane)
![Page 4: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/4.jpg)
Cell/Plasma MembraneFluid Mosaic Model
• The cell, or plasma membrane is made of hydrophobic molecules called phospholipids.
• Proteins located in the membrane can flow/move and perform many functions, including receiving stimuli from the environment and transporting substances in and out of cell.
↓
The plasma membrane is semi-permeable / selectively permeable:
it controls what goes in/out of cell
![Page 5: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/5.jpg)
Cell Membrane Diagram(add details as you go)
Phospholipid bilayer
Outside cell
Inside cell
![Page 6: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/6.jpg)
Phospholipid Bilayer
Hydrophilic Phosphate Heads
HydrophobicTails
Inside of Cell
Outside of Cell
Saturated or Unsaturated?
![Page 7: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/7.jpg)
Cell Transport movement of substances in and out of cell,
needed to maintain homeostasis
What substances does a cell need to move in and out?
Media Links For Lecture\08-02-MembraneStructure.mov
Water moves freely through aquaporins.O2 and CO2 move freely through membrane.
Polar particles need specialized carrier proteins:ions, glucose
![Page 8: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/8.jpg)
Passive Transport
Does not require the use of energy from ATP.(uses the kinetic energy in matter/stuff moving in/out)
Diffusion – Spreading of matter from one area to another. Matter always diffuses from areas of higher concentration to areas of lower concentration EQUILIBRIUM (same concentration everywhere)
Diffusion is “free” because stuff moves down/with a concentration gradient.
Ex.: food coloring spreading/mixing in water;
H2O, O2, CO2, monomer nutrients (some) moving in/out of cell
![Page 9: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/9.jpg)
Movie TimeCell Membrane & Passive Transport
Mrs. Nordstrom:*press esc key (leave presentation mode),
then double click below*
08-02-MembraneStructure.mov
08-10-Diffusion.mov
![Page 10: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/10.jpg)
Osmosis – Diffusion of water through a semi-permeable membrane.
Water flows from areas of lower solute concentration (+ water) to areas of higher solute concentration (- water).
Osmosis - Solution Concentration & Effect on Cells(show cells in a solution & net movement of water) Hypertonic Isotonic Hypotonic Very Hypotonic
![Page 11: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/11.jpg)
Hypertonic Solution(Hypotonic Cell)
Is there a concentration gradient?
H 2O
PlasmolysisCell shrinks
(loses water)
![Page 12: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/12.jpg)
Isotonic Solution(Isotonic Cell)
Is there a concentration gradient?
EquilibriumHappy cell
![Page 13: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/13.jpg)
Hypotonic Solution(Hypertonic Cell)
Is there a concentration gradient?
Cell swells(gains water)
H2O
![Page 14: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/14.jpg)
Very Hypotonic Solution
CytolysisCell lysis
Cell swells(gains water)
H2OH
2O H2O
![Page 15: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/15.jpg)
08-11-Osmosis.mov
• Movie Time *
Osmosis ORThe Movement of Water Through a Semi-Permeable Membrane
Mrs. Nordstrom:*press esc key (leave presentation mode),
then double click below*
![Page 16: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/16.jpg)
Glucose always use F.D.
Ions use F.D.
Facilitated Diffusion – requires the use of a carrier protein on the cell membrane (still no ATP energy needed).Ex.: glucose molecules, ions – why? Polarity…Protein channels are specific for the particles they move.
Carrier Protein / Ion Channel
![Page 17: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/17.jpg)
Movie Time
Facilitated Diffusion IllustrationAt Colorado State Univ. Web Page
![Page 18: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/18.jpg)
Turgid or Flaccid??
Salt Water
Hypoto
nic
Hypertonic
(Macroscopic Term)
![Page 19: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/19.jpg)
Turgid or Flaccid??
Tap Water
HypotonicHyp
erton
ic
(Macroscopic Term)
![Page 20: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/20.jpg)
A B C
![Page 21: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/21.jpg)
Hypertonic -
Hypotonic -
Isotonic –
Prefix refers to the amount of Dissolved Solute (stuff)
Excess ‘stuff’........
Less ‘stuff’……….
Equal ‘stuff’…………
![Page 22: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/22.jpg)
Osmosis Practice
Can you predict what will happen?
Think of water and solute concentrations.
Cell is 95% Water
Cell’s Environment is
90% waterWater Pushes Out
![Page 23: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/23.jpg)
Osmosis
Cell is 95% Water
Cell’s Environment is
100% water
Water Pushes into Cell
![Page 24: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/24.jpg)
Osmosis
Cell is 95% Water
Cell’s Environment is
95% water
EQUILIBRIUM
![Page 25: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/25.jpg)
Osmosis
Cell is 95% Water
Cell’s Environment
is 90% water
The Cell is ___________The Cell’s environment is____________
HypotonicHypertonic
The Future Fate of the Cell might be toPLASMOLYZE
![Page 26: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/26.jpg)
Osmosis
Cell is 95% Water
Cell’s Environment is 100% water
The Cell’s environment is____________The Cell is ___________
HypotonicHypertonic
The Fate of the Cell is Cytolysis
![Page 27: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/27.jpg)
OsmosisCell is 95% Water
Cell’s Environment is 95% water
The Cell’s environment is____________The Cell is ________________________ISOTONIC
The Cell is at Equilibrium
![Page 28: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/28.jpg)
Cyclosis
![Page 29: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/29.jpg)
Plasmolysis
![Page 30: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/30.jpg)
Which is more Plasmolyzed?Which might be further in the
process of re-hydrating?
![Page 31: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/31.jpg)
Normal Plant Cell Isotonic Cell
Isotonic Environment
Hypotonic Cell
Hypertonic Env.
Hypertonic Cell
Hypotonic Env.
Plasmolysis Cytolysis
![Page 32: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/32.jpg)
RBC in Isotonic Environment
The cell is also Isotonic
PlasmolysisCytolysis
Cell is Hypotonic, Env. is Hypertonic
Cell is Hypertonic, Env. Is Hypotonic
![Page 33: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/33.jpg)
A B C
![Page 34: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/34.jpg)
Simple Diffusion
Movement of ‘stuff’ down the Concentration Gradient through a semi-permeable cell membrane by Kinetic Energy
Media Links For Lecture\08-10-Diffusion.mov
![Page 35: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/35.jpg)
Passive Transport1. Osmosis
2. Diffusion
3. Facilitated Diffusion - Glucose
4. Ion Channels
Movement of water in / out of cell
Movement of H2O, O2, CO2, Urea, monomer nutrients: either in / out of cell
Movement of Glucose (C6H12O6) into the cell. Helped by a specific Integrated Protein
Movement of ions in / out of cell, must go through specific integrated proteins
![Page 36: Homeostasis requires exchanging materials with the environment. How do you do it?](https://reader035.fdocuments.in/reader035/viewer/2022062521/56816764550346895ddc4175/html5/thumbnails/36.jpg)