Download cell movement - Mrs Bursk`s Science Class

CELLS
Cell Movement
http://web.uaccb.edu/AcademicDivisions/MathScience/Science/BWheeler/Ess/figs/03_04Figure-U.jpg
ORGANELLES
The cell is the smallest unit of life, their functions include:
Movement
Making proteins
Making energy
Removing waste
Cell movement/structure utilizes the following organelles:
Cytoplasm
Cytoskeleton
Cell wall (more for maintaining shape)
Cell membrane
CYTOPLASM
http://www.learner.org/courses/essential/life/images/show1.cytoplasm.jpg
Cytoplasm holds the inside parts of the cell and helps
move materials through the cell
SIZE MATTERS
Small cells are more efficient
Small cells exchange materials faster than large cells
molecules have less distance to travel from
membrane to cell center
http://25.media.tumblr.com/tumblr_m5yozwWzE31qj8btco1_500.jpg
CYTOSKELETON
Cytoskeleton
helps with cell
movement,
shape and
reproduction
http://www.proteinatlas.org/images_dictionary/microtubules__4__21431__1_blue_green.jpg
CELL WALL
In plants, the
cell wall helps
the cell maintain
shape especially
when the cell
has too little or
too much water
http://academic.pgcc.edu/~kroberts/Lecture/Chapter%203/03-24_EukaryCellWall_L.jpg
http://askabiologist.asu.edu/sites/default/
files/resources/articles/cells/plant_cell.jpg
CELL MEMBRANE
The cell membrane is the outer boundary of the cell, it
separates the outside from the inside
The cell membrane has 2 layers: it is also known as a
phospholipid bilayer
It is studded with trans-membrane proteins, protein
channels and other molecules
http://store.bioetch.com/sites/store.bioetch.com/files/imagecache/product_full/cell_membrane_02.jpg
SELECTIVE PERMEABILITY
The cell membrane controls what comes and goes out
of the cell it is selective
Water, small molecules and nonpolar molecules can
move freely through the membrane, the membrane is
permeable for these molecules
http://4e7221.medialib.glogster.com/media/77483241710e83957bc7ab27e6157eef67b32101efb20098763d3564a352fbf1/cell-membrane.png
CELL MOVEMENT
Molecules that pass freely through the cell do so by:
Diffusion
Osmosis (water only)
For molecules that do not pass through the semipermeable membrane the cell transports the
molecules across by:
Facilitated diffusion
DIFFUSION
Diffusion is the movement of
substances down their concentration
gradient (from an area of high
concentration to an area of low
concentration)
http://faculty.southwest.tn.edu/rburkett/GB1-os18.jpg
http://www.toltec.biz/how_dialysis_works/diffusion.jpg
OSMOSIS
Osmosis is the diffusion of
water
Water moves down its
concentration gradient
Water’s concentration
depends on the amount of
solute (a substance dissolved
in a liquid) in solution
More solute means less water
High Water
High Solute,
low water
http://apbrwww5.apsu.edu/thompsonj/Anatomy%20&%20Physiology/2010/2010%20Exam%20Reviews/Exam%201%20Review/osmosis.bmp
https://www.youtube.com/watch?v=nHWUAdkYq4Q
FACILITATED DIFFUSION
Facilitated diffusion allows for larger molecules to pass
across the membrane
The movement is facilitated by protein channels in the
membrane
http://djgarbe.edublogs.org/files/2011/06/07_15FacilitatedDiffusionA-27p2owd.jpg