Cell structure and The Microscope.

Nadine Egan
Mind Map by Nadine Egan, updated more than 1 year ago
Nadine Egan
Created by Nadine Egan almost 4 years ago



Resource summary

Cell structure and The Microscope.
1 The Microscope.
1.2 The Parts Of The Microscope.
1.2.1 Eyepiece or Ocular lens: An eyepiece is a magnifying lens attached to the microscope which helps in magnifying the sample object. It is called an eyepiece as we need to place our eye near it in order to see the magnifying image of the sample.
1.2.2 Arm: The arm is the part of microscope that connects to the base and helps carry the microscope easily. One can hold the arm with on hand and put another hand under the base of the microscope so that it can be carried easily.
1.2.3 Stage: A stage is an indispensable part of the microscope. It is a flat surface where the slide with the specimen is placed. A mechanical stage is a stage used when working with higher magnifications. It is moved by using knobs as even the slightest moment can affect the results.
1.2.4 Objective lens: Objective lens is the part of microscope responsible for magnifying the image of specimen. Usually there are three objective lenses in a standard microscope of 10X, 40X and 100X. Depending upon the aim of study and nature of the specimen, the most suitable objective lens can be brought to use.
1.2.5 Coarse adjustment knob: A coarse adjustment knob is a knob present on the arm of a microscope. The main function of this knob is to move the specimen back or forth to adjust the slide containing specimen in order to bring it to focus and show the best image possible. The coarse adjustment should be carefully moved and adjusted to attain desired results.
1.2.6 Fine Adjustment Knob: This knob is a sub part of the Coarse adjustment knob. It is used to bring the specimen into sharp focus.
2 Plant cell
2.2 Its main function is storage. Vacuoles are found in the cytoplasm of most plant cells. They are membrane bound organelles, they perform functions of secretion, excretion and storage. Tonoplast: A vacuole that is surrounded by a membrane is called tonoplast.
3 Animal cell
3.2 Some cells have more than one nucleolus. nucleus - spherical body containing many organelles, including the nucleolus. The nucleus controls many of the functions of the cell (by controlling protein synthesis) and contains DNA (in chromosomes). The nucleus is surrounded by the nuclear membrane.
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