how come we can't even see the little cells even in a microscope but know about them.?

Answer 1

You cannot see most cells with an ordinary microscope, but a scanning electron microscope can magnify thousands and thousands of times...;

Answer 2

Are you people totally goofy or what? Any standard microscope used in high school biology can be used to see individual cells. Perhaps the poster was thinking of molecules or atoms

Answer 3

In a typical SEM electrons are thermionically emitted from a tungsten or lanthanum hexaboride (LaB6) cathode and are accelerated towards an anode; alternatively electrons can be emitted via field emission (FE). Tungsten is used because it has the highest melting point and lowest vapour pressure of all metals, thereby allowing it to be heated for electron emission. The electron beam, which typically has an energy ranging from a few hundred eV to 50 keV, is focused by one or two condenser lenses into a beam with a very fine focal spot sized 1 nm to 5 nm. The beam passes through pairs of scanning coils in the objective lens, which deflect the beam in a raster fashion over a rectangular area of the sample surface. Through these scattering events, the primary electron beam effectively spreads and fills a teardrop-shaped volume, known as the interaction volume, extending from less than 100 nm to around 5 µm into the surface. Interactions in this region lead to the subsequent emission of electrons which are then detected to produce an image. X-rays, which are also produced by the interaction of electrons with the sample, may also be detected in an SEM equipped for energy-dispersive X-ray spectroscopy or wavelength dispersive X-ray spectroscopy. Do you have any further questions?

Answer 4

Uh... if I remember correctly, about thirty years ago in my professional training, we used standard light microscopes to study cells in both Histology and Pathology classes. And, we used the oil immersion lens to look at bacteria which are much smaller than human cells.

Answer 5

we can, but we can't see them with a regular light microscope, you would need a SEM or a TEM which would cost around a million dollars to see them

Answer 6

cause we know cells make up cells