Exploration of Light Microscopes
What does the word microscope mean: The first part of the word "Micro"
means tiny. The "scope" part means to look at or view. Microscopes are
tools that are used too enlarge images of small objects so that they
can be studied.
A light microscope is an instrument made up of two lens they are
eyepiece lens and the object lens combined they produce a much greater
magnification that what is possible with just one single lens. The
microscope also has a variety of knobs to focus the picture seen
thought the microscope. The light microscope is also known as the
compound microscope this is because it uses more than one lens.
The light microscope uses visible light to detect small objects; the
microscope consists of an optical instrument that magnifies the image
of an object. It is probably the most used research tool in biology.
The total magnification is calculated by multiplying the magnification
of the two lenses inside the microscope. Images looked at under the
light microscope are reversed and inverted.
Functions Of The Components Seen Under A Light Microscope
Cytoplasm: is a partly fluid material, which can flow slowly and in
which many other substances are suspended such as large fat and
protein molecules. Many of the chemical reactions take place in the
cytoplasm, which will provide the cell with energy and allow it to
build up larger molecules that it needs. Studying the cell further and
using better more powerful microscopes has shown that the cytoplasm
actually contains lots of small structures called organelles. These
have different roles and separate the reactions. In a cell. Examples
are mitochondria where energy is released and ribosomes where proteins
are made in a cell.
Plasma membrane: consists of two layers of phospholipids (a fatty
substance) with some protein molecules embedded in them.
The membrane protein performs several functions. Branched carbohydrate
molecules attached to the outside of some membrane protein molecules
give the cell its immunological identity. They can act as specific
receptors for hormones and other chemicals massagers. Some of them are
enzymes and some are involved in transport across the membrane.
Nuclear membrane: the layer that surrounds the nucleus. The nuclear
membrane is a double membrane formed by two lipid bilayers separated
by a gap of20-40nm (the perinuclear space). About 15% of its surface
is made of nuclear pores, which indicate that it too has a large
amount of substances passing in and out of the nucleus.
Nucleus: in every cell in the body has a nucleus, with the exception
of the mature e erythrocytes (the red blood cells). The nucleus is the
largest structure inside the cell and is contained with in a membrane