cell structure & organisation. chapter outline (a) identify cell structures (including...
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Cell Structure & Cell Structure & OrganisationOrganisation
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Chapter OutlineChapter Outline(a) identify cell structures (including organelles) of
typical plant and animal cells from diagrams, photomicrographs and as seen under the light microscope using prepared slides and fresh material treated with an appropriate temporary staining technique:
• chloroplasts• cell membrane• cell wall• cytoplasm• cell vacuoles • nucleus
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Chapter OutlineChapter Outline(b) identify the following organelles from diagrams
and electronmicrographs:• mitochondria• ribosomes
(c) state the functions of the organelles identified above
(d) compare the structure of typical animal and plant cells
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Chapter OutlineChapter Outline(e) state, in simple terms, the relationship between
cell function and cell structure for the following:• absorption – root hair cells• conduction and support – xylem vessels• transport of oxygen – red blood cells
(f) differentiate cell, tissue, organ and organ system
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What is a cell?What is a cell?
• Building blocks of life
• Simplest units of life
• Chemical reactions in the cell keeps us alive
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CellsCells
White Blood CellsRed Blood Cells
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CellsCells
Embryonic Stem Cells
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Other Examples of CellsOther Examples of Cells
Amoeba Proteus
Plant Stem
Red Blood Cell
Nerve Cell
Bacteria
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CellsCells
What does a cell consists of?Each living cell consists of living material called protoplasm.
Protoplasm:• Water makes up 70% of protoplasm• Proteins• Carbohydrates• Fats
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ProtoplasmProtoplasm
1) Cell Surface Membrane
2) Cytoplasm
3) Nucleus
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Cell Structures in Plant Cell Structures in Plant and Animal Cellsand Animal Cells
• nucleus• cytoplasm• cell membrane• cell wall• cell vacuoles • ribosomes• mitochondria• chloroplasts
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Animal and Plant CellsAnimal and Plant Cells
Animal Cell Plant Cell
Cell Structure and Function: http://lgfl.skoool.co.uk/keystage3.aspx?id=63
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Animal CellAnimal Cell
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Animal CellAnimal Cell
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Cell Surface MembraneCell Surface Membrane• Surrounds the cytoplasm of the cell
• Partially permeable membrane
– Allows some substances but not all to move in and out of the cell
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NucleusNucleus• Surrounded by a membrane
called the nuclear envelope• Contains one or more
nucleoli • Contains chromatin
Functions of the nucleus:
1. Controls cell activities such as cell growth and the repair of
worn-out parts
2. Essential for cell division
Nucleolus
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CytoplasmCytoplasm• Between the cell surface membrane and the nucleus
• Contains enzymes and organelles
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Organelles in the CytoplasmOrganelles in the Cytoplasm
• Mitochondria
• Ribosomes
• Chloroplasts (only in plant cells)
• Cell vacuoles
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MitochondriaMitochondria• Aerobic respiration occurs in the mitochondria• Energy production• Energy used to perform cell activities such as
growth and reproduction
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RibosomesRibosomes• Required for protein synthesis in the cell
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Vacuoles in Animal CellsVacuoles in Animal Cells
• A vacuole is a fluid-filled space enclosed by a membrane
• Animal cells have many small vacuoles that contain water and food substances such as proteins and carbohydrates
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Label and identify the diagramLabel and identify the diagram
Pop Quiz!
AB
C
D
F
E
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Plant CellPlant Cell
Plant Cells: http://lgfl.skoool.co.uk/keystage3.aspx?id=63
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Plant CellPlant Cell
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Differences Between Animal Differences Between Animal and Plant Cellsand Plant Cells
Animal Cells Plant Cells
Cell wall absent Cell wall present
Chloroplasts absent Chloroplasts present
Vacuoles are small, temporary in animal cells
Vacuoles are large, sap-filled in plant cells
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Cell WallCell Wall• Surrounds the cell surface
membrane• Cell wall is made of
cellulose• Protects the cell from injury• Gives the plant cell a fixed
shape• Cell wall is fully permeable
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ChloroplastsChloroplasts
• Found only in plant cells
• Chloroplasts contain a green pigment called chlorophyll
• Chlorophyll is essential for photosynthesis, the process by which plants make food
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Vacuoles in Plant CellsVacuoles in Plant Cells
• Plant cells usually have a large central vacuole which contains a liquid called cell sap
• Cell sap contains dissolved substances such as sugars, mineral salts and amino acids
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Pop Quiz!
Label and identify the diagramLabel and identify the diagram
A
B
C
F
D
E
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Specialised CellsSpecialised Cells
Red Blood Cell
Root Hair Cell
Nerve Cell
Sperm Cell
Egg Cell
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Cell DifferentiationCell DifferentiationThe process by which cells develop special structures or lose certain structures to enable them to carry out specific functions.
Hence, cells become differentiated to form specialised cells.
The structure of each cell is adapted to perform the specific functions of the cell.
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Cell DifferentiationCell Differentiation
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How is cell structure How is cell structure related to cell function?related to cell function?
1) Red Blood Cell
Cell Structure Adaptation to Function
Contains haemoglobin Haemoglobin transports oxygen from the lungs to all parts of the body.
No nucleus Carry more haemoglobin which leads to increased transport of oxygen.
Circular biconcave shape Increased surface area to volume ratio of the cell. Hence, increased transport of oxygen.
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How is cell structure How is cell structure related to cell function?related to cell function?
Cell Structure Adaptation to Function
Long hollow tubes (no protoplasm)
Enables water to move easily through the lumen.
Lignified walls Lignin strengthens the walls and prevents the xylem vessels from collapsing.
2) Xylem Vessel
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How is cell structure How is cell structure related to cell function?related to cell function?
Cell Structure Adaptation to Function
Long and narrow Increased surface area to volume ratio of the cell which leads to increased absorption of water and mineral salts from the soil.
3) Root Hair Cell
Specialised Plant and Animal Cells: http://lgfl.skoool.co.uk/keystage3.aspx?id=63
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How do cells How do cells work together in work together in a multi-cellular a multi-cellular
organism?organism?
Organisation in Living Things: http://lgfl.skoool.co.uk/keystage3.aspx?id=63
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TissueTissueA tissue is a group of similar cells which work together to perform a specific function.
Examples of tissues:• Muscle, the lining of the intestine, the lining of the lungs, phloem, root hair tissue
Connective Tissue
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OrganOrganDifferent tissues may be combined together to form organs.
An organ is a structure made up of different tissues working together to perform a specific function.
Examples of organs:• Heart, lung, brain, leaf, root
Lungs
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An organ is a structure made up of different tissues working together to perform a specific function.
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Organ SystemOrgan SystemOrgans work together to form organ systems.
Various systems work together to make up the entire organism.
Examples of organ systems:• Circulatory system, respiratory system, digestive system, nervous system and
reproductive system
Circulatory System
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Organ SystemsOrgan Systems
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SystemSystem OrgansOrgansDigestive Esophagus
Stomach
Small intestine
Large intestine
Respiratory Trachea
Lungs
Organs work together to form organ systems.
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Pop Quiz!
Q1. Write out the order of cell organisation within an organism.
Q2. Give an example of an animal system with the order of cell organisation stated above.
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Organism
Pop Quiz!
Q1. Write out the order of cell organisation within an organism.
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• Intestinal cell intestinal muscle small intestine digestive system human
• Nerve cell nerve tissue eye sensory system bird
Pop Quiz!
Q2. Give an example of an animal system with the order of cell organisation stated above.