State a function of each of the following components of a cell - Leaving Cert Biology - Question 8 - 2006

The cell membrane serves several key functions: it acts as a selectively permeable barrier that controls the entry and exit of substances, protects the interior of the cell, and facilitates communication and signaling with other cells through receptors.

I used an epithelial cell, which is commonly found in the layers of tissues covering the body and organs.

I obtained the cell by scraping the surface of the inner cheek with a sterile cotton swab, which allows for the collection of epithelial cells.

The stain used was methylene blue.

The methylene blue stain was applied to the slide by placing a few drops directly onto the specimen before gently covering it with a cover slip. This ensures that the cells are adequately stained while minimizing the risk of air bubbles.

A cover slip is placed on the slide to prevent the specimen from drying out and to protect the lens of the microscope while making it easier to observe the cells.

The cover slip was applied at an angle, gently lowering one edge onto the slide to avoid trapping air or bubbles, which can obstruct the view.

This angled application helps to prevent the trapping of air or bubbles under the cover slip, ensuring a clearer and more accurate observation of the specimen.

Upon viewing the stained cell under the microscope, the cytoplasm appeared paler compared to the darker blue nucleus. This contrast enhances visibility and helps distinguish between the two cellular components.