snc 2d: tissues, organs and systems
TRANSCRIPT
SNC 2D: Tissues, Organs and Systems
http://www.youtube.com/watch?v=Ow0jH2Eg8v4
SNC 2D: Tissues, Organs and Systems
• Recognize the basic structure of cells
• Identify specialized cells
• Understand the connection between specialized structures and functions of some plant and animal cells
• http://www.youtube.com/watch?v=I8uXewS9dJU
Specialized cells – learning goals
SNC 2D: Tissues, Organs and Systems
CELLS: Basic Structure
Cell membrane
Cytoplasm
Nucleus
Cell Wall
Vacuole
Chloroplast
SNC 2D: Tissues, Organs and Systems
All cells have these features in common:
a nucleus contains genetic material which controls the cell's behaviour.
cytoplasm where chemical processes take place
a cell membrane which controls what passes into and out of the cell
SNC 2D: Tissues, Organs and SystemsSome Specialized Cells - Recognize Any?
SNC 2D: Tissues, Organs and Systems
Image 1 - Red Blood Cells
Image 3 - Nerve Cells
Image 2 - Sperm Cells
Specialized Animal Cells
SNC 2D: Tissues, Organs and Systems
Image 1 - Red Blood Cells
Example of cell Specific function Specialized features suited to the function
Red blood cellCarry oxygen to
the cells
1. Thin outer membrane allows oxygen to diffuse through easily.
2. No nucleus means that the whole cell is full of haemoglobin (which carries the oxygen)
SNC 2D: Tissues, Organs and Systems
Image 2 - Sperm Cells
Example of cell Specific function Specialized features suited to the function
Sperm cell(male gamete)
To fertilize the egg cell (female
gamete)
1. The head, contains DNA
2. The middle section, is full of mitochondria for energy.
3. The tail moves the sperm to the egg.
SNC 2D: Tissues, Organs and Systems
Image 3 - Nerve Cells
Example of cell Specific function Specialized features suited to the function
Nerve cell(motor
neurone)
Pass sensory impulses from one
area to another
1. Dendrites make connections with other neurones.
2. Long nerve fibre to carry the impulse
SNC 2D: Tissues, Organs and Systems
Image 4- Leaf Cells Image 5- Pollen Cell
Image 6 - Guard Cells
Specialized Plant Cells
SNC 2D: Tissues, Organs and Systems
Image 4- Leaf Cells
Example of cell Specific function Specialized features suited to the function
Leaf palisade cell
Carries out photosynthesis Packed with chloroplasts
SNC 2D: Tissues, Organs and Systems
Image 5- Pollen Cell
Example of cell Specific function Specialized features suited to the function
Pollen cell (male
gametes)
Fertilize the ovules (female gametes)
1. Have a hard protective outer coat to survive bad conditions.
2. Shape and surface of outer coat is adapted to method of dispersal
SNC 2D: Tissues, Organs and Systems
Image 6 - Guard Cells
Example of cell
Specific functionSpecialized features suited to the
function
Guard cell Opens/closes leaf pore1. Regulate the size of leaf pore2. Change shape easily
SNC 2D: Tissues, Organs and Systems
Photos and images are credited as follows:
Image 1 – red blood cells. In the public domain as work of the US federal government
http://en.wikipedia.org/wiki/File:Redbloodcells.jpg
Image 2 – Sperm cells. Photo courtesy of Gilberto Santa Rosa. This photo is licensed under Creative Commons Attribution 2.0 license. http://commons.wikimedia.org/wiki/File:Sperm-20051108.jpg
Image 3 – Nerve cells. Photo courtesy of Fanny CASTETS . This photo is licensed under the Creative Commons Attribution ShareAlike 2.5, Attribution ShareAlike 2.0 and Attribution ShareAlike 1.0 License.
http://commons.wikimedia.org/wiki/File:Neuronehisto.jpg
Image 4 – Leaf cells. Photo courtesy of Kristian Peters. This image is published under the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
http://commons.wikimedia.org/wiki/File:Plagiomnium_affine_laminazellen.jpeg
Image 5 – Guard Cells. Photo courtesy of KuriPop. The image has been cropped to show only the open stomatal pore. The scale has been removed. This image is published under the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation. http://commons.wikimedia.org/wiki/File:Stomata_open_close.jpg
Image 6 – Pollen cell. In the public domain, all rights permitted. http://commons.wikimedia.org/wiki/File:Ipomoea_purpurea_pollen.jpg
See page 59-60 for other images of specialized cells