Bell work
description
Transcript of Bell work
![Page 1: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/1.jpg)
Bell work
Sandworms are annelid worms that live on theseafloor. They absorb oxygen and excrete wastesthrough their skin. Which characteristic will besthelp the worm carry out these functions?A. large number of heartsB. large diameter blood vesselsC. large mouth compared to body volume D. large surface area compared to body volume
![Page 2: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/2.jpg)
Science Fact of the Day:The human heart has enough pressure to squirt
blood up to 30 feet away.
![Page 3: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/3.jpg)
CO:
LO:
![Page 4: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/4.jpg)
All cells are surrounded by a thin, flexible barrier known as a cell membrane.
![Page 5: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/5.jpg)
What is the cell membrane’s function (job)?
(2 things)
![Page 6: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/6.jpg)
The two main functions of the cell membrane are:
1) to regulate what enters and leaves the cell and
2) to provide protection and support.
![Page 7: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/7.jpg)
What is the cell membrane made (composed) of?
(3 types of molecules)
![Page 8: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/8.jpg)
The composition of cell membranes is a double-layered sheet called a lipid bilayer.
DRAW THIS!
Lipid
Phosphate
carbohydrate
Bi- means 2
Also called the phospholipid bilayer
![Page 9: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/9.jpg)
Proteins are embedded in the lipid bilayer. Proteins form channels or pumps that help
move large materials across the cell membrane.
![Page 10: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/10.jpg)
Carbohydrates are attached to many
proteins embedded on the outside of the
bilayer.
The carbohydrates allow individual cells
to identify one another.
![Page 11: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/11.jpg)
How do substances move into/out of the cell membrane?
(4 ways)
![Page 13: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/13.jpg)
Every living thing lives in a liquid environment that it needs to survive.
![Page 14: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/14.jpg)
In a solution, particles are constantly
moving.
They collide with one
another and tend to spread out randomly.
![Page 15: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/15.jpg)
Particles move from an area of high concentration to an area of low
concentration.This process is known as diffusion.
![Page 16: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/16.jpg)
The concentration is the amount of a
substance dissolved into water.
(Kool-aid demo)
![Page 17: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/17.jpg)
A concentration gradient is a difference between two concentrations.Diffusion is the movement of particles down the concentration gradient.
High Concentration
Low Concentration
![Page 18: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/18.jpg)
When the concentration of a solute is the same
throughout a system, the system
has reached equilibrium.
When equilibrium is reached, particles
do continue to move across the
membrane.
![Page 19: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/19.jpg)
Substances that diffuse across a membrane do not require the cell to use energy.
![Page 20: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/20.jpg)
If a substance is able to diffuse across a membrane, the
membrane is said to be permeable to it.
If a substance cannot diffuse across a membrane, the
membrane is said to be impermeable to it.
![Page 21: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/21.jpg)
Selectively permeable means that some substances can pass across while others cannot.
Biological membranes are selectively permeable.
![Page 22: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/22.jpg)
Diffusion of water through a selectively permeable membrane is called osmosis.
Remember: SALT SUCKS
![Page 23: Bell work](https://reader035.fdocuments.in/reader035/viewer/2022081517/56816361550346895dd42e5d/html5/thumbnails/23.jpg)
Isotonic means “same strength”. Hypertonic means “above strength”. Hypotonic means “below strength”.
Draw This
Label: IsotonicWater: SameSolute: Same
Label: HypertonicWater: Low (outside cell)Solute: High
Label: HypotonicWater: High (outside cell)Solute: Low