Histology: Cell and Resolution Power

Topics: Cell, Organelle, Endoplasmic reticulum, Golgi apparatus / Pages: 2 (495 words) / Published: Nov 14th, 2013
Give reasons (s)
1- Formaline is used as fixative in preparation for LM examinations
2- Resolution power is difference from magnification power

Complete
1- The cells are the smallest …… and …… units in the body.
2- The size of tissue sample for histological preparation is …… in light microscope and ……. in electron microscope.
3- Fixative used in tissue preparation for LM examination is …….. while in EM is ……..
4- Substance used for tissue embedding in preparation for LM examination is ……..… while in EM is ………...
5- The most common dye use in routine histology is …….. .
6- The resolution power is ……………………..
7- The resolution power for LM is……… and for EM is ……….
8- The source of illumination in electron microscope is a beam of high velocity ……..instead of ………… light.
9- The cutting device used in is called …….. in tissue preparation for LM while in EM it is called ……….
10- The most common types of microscopes are ……. And ………… microscopes

Write True and false
1- The tissues are the smallest structural and functional units in the body.
2- Cells vary in size from 4 to 200 μm
3- Each organ is formed of one kind of tissue.
4- The action of fixatives on jelly like tissue components resembles the effect that boiling has on an egg.
5- The resolution power for LM is o.2 nm and for EM is 0.2 μm.
6- The resolution power is the least distance between two successive points to be distinguished as single points
7- The ordinary light microscope uses a visible light source with a system of electromagnetic coils condenser lenses
8- The source of illumination in electron microscope is a beam of high velocity waves of visual light
9- A system is an organization of different organs that together perform the more complex functions
10- The cutting device used in LM preparation is called ultramicrotome

Chapter Two
Enumerate
1- Molecular structure and percentage of cell membrane?
2- Functions of cell membrane?
3- Components of the nucleus?

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