Patellar reflex

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

Gametes

The zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction.

Endocrine system

Glands of the endocrine system secrete hormones into the blood.

Platypus

A mammal with features typical of reptiles: it lays eggs and has a cloaca.

Female reproductive system (intermediate)

The reproductive system is a series of organs working together for the purpose of reproduction.

Tooth brushing

Careful tooth brushing is an important part of oral hygiene.

Volume of a tetrahedron

To calculate the volume of a tetrahedron we start by calculating the volume of a prism.

Ammonites

An extinct group of Cephalopoda, with solid external skeletons. They are excellent index fossils.

Knee joint

The knee joint is made up by the femur, the tibia and the kneecap.

Oil platform

A long pipe in the centre of the tower penetrates the ocean bed until it reaches the layer that contains oil.

Port

Ports must provide necessary infrastructure and services for industry and marine transport.

European badger

The European badger is an omnivorous, nocturnal animal. Badger colonies live in large burrow systems, called setts.

Spider silk, spider web

While the density of spider silk is less than that of nylon filaments, its tensile strength is greater than that of steel.

Aurora cruiser ship (1900)

The name of the Russian armoured cruiser became well known during the October Revolution of 1917.

Apatosaurus

Long-necked herbivorous dinosaur with a robust body.

Electric surface transport

Trolleybuses and trams are environment-friendly means of public transport

Sharks

A group of fish characterised by a cartilaginous skeleton, well-known species include the great white shark and the great hammerhead shark.

How does it work? – Escalator

This animation demonstrates how an escalator works.

Administrative divisions of Germany

This animation presents the states and state capitals of Germany

Horse mill

Machines powered by animals were mainly used in mills, for grinding grains.

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