Important Points To be Considered Important Points To
Important Points To be Considered
Important Points To be Considered ØStudent who are late more than 10 mins , NO LESSON will be REPEATED. ØNO CAMERA are allowed in the lab at all.
exam Histology Anatomy FIRST QUIZ 5 Midterm exam 15 SECOND QUIZ 5 Final exam 10 Monday Wednesday 6/1/1437 19/10/2015 8/1/1437 21/10/2015 4/2/1437 16/11/2015 6/2/1437 18/11/2015 18/2/1437 30/11/2015 20/2/1437 2/12/2015 3/3/1437 14/12/2015 5/3/1437 16/12/2015
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MICROSCOPY
APPLICATIONS OF COMPOUND MICROSCOPE • It is used to study cell parts. Example: • The organization of tissues • The structure of developing embryos with many other important applications
Parts of the Microscope: The parts of the microscope can be grouped in three systems: 1. The magnification system. 2. The mounting and movement system. 3. The illumination system.
The body tube: carries the ocular lenses The nose piece: Carries the objective lenses and move them accordingly above the stage The stage: Horizontal platform upon which the slide of interests The base: Supports the microscope The arm: Supports and connects the upper part of the microscope The coarse focusing knob: for stage movement The fine focusing knob: for image sharpness The mounting and movement system
THE MAGNIFICATION SYSTEM The ocular lenses: 5 X, 10 X, and 15 X The objective lenses: Scanning lens: 3. 5 X or 4 X or 5 X Low power lens: 10 X High power lens: 40 X Oil immersion lens: 100 X How to calculate the magnification power? Magnification power = ocular lens x objective lens. (e. g. ) 10 X x 40 X = 400 X hint: Don’t forget the unit
The iris diaphragm: controls the amount of light reaching the slide The condenser: collects and concentrate the light THE ILLUMINATION SYSTEM The illuminator: light source
THE CELL
THE CELL • It is the functional and structural unit in organisms. • There are different cell structures depending upon their location and function in the body. 3 major cell components: • Genetic material. • Cytoplasm. • Cell membrane.
CELL TYPES Two major cell types depending on the arrangement of the genetic material inside the cell: Prokaryotic cells (pro = before; Karyone = nucleus): • Nucleus is absent. • The region where the DNA is located in the cytoplasm is called nucleoid Eukaryotic cells (True nucleated cells): • Nucleus is present. • DNA is associated with proteins which forms chromatin
PROKARYOTES: BACTERIA Bacillus: Rod shape and occur in strands. Coccus: Rounded and occur in colonies or strands.
EUKARYOTES Plant cells: Ø Have cell wall. Ø Example: onion cells. Ø Rectangular with eccentric nucleus. Onion cells Animal cells : Ø Do NOT have a cell wall. Animal cells
Simple Squamous Epithelium ( Lining of mouth ) 1. Cell membrane 2. Cytoplasm 3. Nucleus
Thank you for your attention
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