Patellar reflex

The reflex triggered by the stretching of the thigh extensor muscle is the patellar reflex.

Ratio of volumes of similar solids

This 3D scene explains the correlation between the ratio of similarity and the ratio of volume of geometric solids.

Great Mosque of Djenné (1907)

The mosque, built in a distinctive architectural style, is the largest adobe structure in the world.

Russian alphabet game

Practise the Russian alphabet, build words from letters.

The upper gastrointestinal tract

During swallowing food travels from the mouth cavity into the stomach.

Bone structure

This scene explains the structure and functions of the bones.

Fjord

A fjord is a long, narrow inlet with steep sides, created in a valley carved by glacial activity.

Glaciation

The last Ice Age ended about 13 thousand years ago.

Turkish bath (16th century)

One of the positive influences of the Ottoman invasion of Europe was the construction of baths.

Jameh Mosque (Isfahan, 15th century)

Its architectural solutions and ornamentation rank this mosque among the masterpieces of Islamic art.

Battle of Thermopylae (480 BC)

The battle of the Greek-Persian War became famous for the heroic sacrifice of the Spartan soldiers.

Typical dwelling types

Every era and every culture has specific residential buildings.

Geyser

A geyser is a spring characterised by intermittent discharge of water and steam.

The adrenal glands

The adrenal glands are responsible for maintaining homeostasis and producing a rapid response in stressful situations.

The structure of prokaryotic and eukaryotic cells

There are two basic cell types: prokaryotic and eukaryotic cells.

NAD⁺, NADP⁺, NADPH

NAD⁺ is a coenzyme that plays an important role mainly in catabolic processes, while NADP is important in anabolic processes as hydrogen carriers.

ADP, ATP

ATP is the main source of energy for cells.

Traditional Eskimo lifestyle

Igloos were the typical dwellings built by Eskimos living in the Arctic zone.

Water supply system

The water supply system provides clean and safe drinking water for the consumers.

The history of human migration

The migration of large human populations began in Ancient times.

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