Substances in tobacco smoke

Don’t smoke! This video demonstrates what happens in the lungs when a person smokes.

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The patellar reflex

When the patellar ligament is lightly tapped, the extensor muscle stretches slightly.

Studying adsorption

Purifying a solution coloured with fuchsine dye with finely ground activated carbon granules and...

The effect of bile in fat dispersion

If bile contains no digestive enzymes, why does it play such an important role in digestion? How...

What are lichens made of?

A combination of fungal hyphae and algal cells viewed under a light microscope at a hundred...

The pupillary light reflex

In strong light the pupil contracts, while in low light it dilates.

Preparing a tissue sample from an onion

Examination of long, rectangular onion epidermal cells under the microscope at 100x magnification.

Protein denaturation

Proteins are sensitive to environmental changes. In this video we demonstrate how easy it is to...

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