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Siemens Stiftung

Inner ear section

Labeled graphic:
Section view with the most important parts of the inner ear. The most important parts are highlighted in color.

Both the sense of balance and the sense of hearing are situated in the inner ear.
The inner ear is formed by a complicated system of cavities. This system is called the bony labyrinth.
Distinction is made between the cochlea, the semi-circular canals and, in between, the vestibule. In the cochlea there are two openings each covered with a taut membrane. These are named after their shape, i.e. round window and oval window. The oval window is a sort of entrance for sound and the round window a sort of exit.

Information and ideas:
Helps to put the inner ear in the overall context of the structure of the ear.
Can be used, for example in a worksheet, for work together in class with the digital projector, as overhead transparency.

Relevant for teaching:
Structure and function of a sensory organ
Reception of stimuli and transmission of information
Functions of senses

Medientypen

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Lernalter

11-18

Schlüsselwörter

Anatomy (human) Ear

Sprachen

Englisch

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Siemens Stiftung

Incandescent lamp

Photo:
The light in this incandescent lamp is generated by heating a filament to high temperatures.


In many light sources, for example, incandescent lamps or high-pressure gas-discharge lamps, a continuous light spectrum is generated by the interaction of large numbers of photons at very different energy levels. This means that the complete range of wavelengths is included, but in different proportions depending on the temperature.
Incidentally, the wavelength and energy distribution of incandescent lamps fit the Planck radiation formula extremely well.

Information and ideas:
Example of how physical laws are translated into technical applications. Double-coiled filaments are used, among other reasons, to increase the radiant surface.

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Siemens Stiftung

Frequency differentiation in the uncurled cochlea

Labeled graphic:
High-pitched tones are heard in the front part of the cochlea, low tones are heard in the back part.

As the sense of hearing is able to differentiate locations of the nerves, it is able to recognize the frequencies.

Information and ideas:
This graphic is good for creating a link between the topics of "Sound? and "Hearing?.
Further information regarding this graphic is available as information sheet on the media portal of the Siemens Stiftung.

Relevant for teaching:
Perception of sound
Human hearing ability
Communication and understanding
The human body
Structure and functions of a sensory organ

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Siemens Stiftung

Excitation energy of a water molecule

Chart:
Water can absorb heat energy in the form of vibrations or movement of its molecules. This energy content depends on the physical state: steam contains more energy than liquid water, for example.

The material surrounding us takes on different physical states depending on pressure and temperature (in Kelvin): solid, liquid or gaseous. This also applies to water: During a phase change from solid to liquid and liquid to gas respectively the energy of the water molecules increases without the temperature rising - the diagram for water shows plateaus. The values of these plateaus are approx. 6 kJ/mol (melting heat) and approx. 40,7 kJ/mol (vaporization heat) respectively.

Information and ideas:
Ideally suited for explaining the topic of phase equilibrium.

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Siemens Stiftung

Entire ear section (b/w)

Unlabeled graphic:
Simple black and white cross-section of ear. For worksheets, printouts etc.

With the help of this graphic the most important functional areas of the ear and their significance in the hearing process can be explained.

Information and ideas:
The teacher can label the graphic together with the students on the computer screen or get the students to label it themselves either on a printout or at the computer screen.

Relevant for teaching:
The human body
Structure and function of a sensory organ

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Siemens Stiftung

Cotton wool buds

Photo:
Cotton wool buds.

Attention when cleaning ears: Cotton wool buds must not be pushed too far into the ear canal as this can injure the eardrum.

Information and ideas:
Use picture to start discussion on the topic of "Health care" and specifically "How to take care of ears".

Relevant for teaching:
Personal health care

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Siemens Stiftung

Car

Photo:
Car as typical source of sound and noise in traffic.

A car in normal town traffic produces about 80 decibels.

Information and ideas:
Use picture to introduce topic or for illustration purposes.

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Siemens Stiftung

Age-related hearing loss

Photo:
Hearing ability is reduced with increasing age. This can cause danger for older people in road traffic.

Age-related hearing loss or presbycusis is the gradual increase in hearing impairment caused by the dying of cells in the inner ear or auditory nerve. It usually begins with a loss of high frequency tones and then, later on, medium frequency tones. Both ears are equally affected which means that from a certain degree of hearing impairment, normal everyday speech can only be understood with difficulty. This hearing impairment causes problems for older people, for example, in road traffic. Other road users have to be particularly alert.

Information and ideas:
This special situation can be used to lead on to a general discussion of hearing impairment or hearing loss and what it means for young people as well. The question of how to deal and communicate with such people can be discussed.

Relevant for teaching:
Hearing defects/hearing impairment
How hearing works
Sound transduction

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Siemens Stiftung

Reacción de detección para grasas no saturadas (6)

Fotografía:
La agitación del tubo de ensayo que contiene el aceite de oliva después de casi tres minutos tampoco conduce a una coloración azul.

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Siemens Stiftung

Reacción de detección para grasas insaturadas (1)

Fotografía:
Los reactivos aceite de oliva (izquierda) y mantequilla (derecha) en tubos de ensayo con ácido acético diluido.

Aquí se depositaron 40 ml de ácido acético (5 ml de vinagre en 35 ml de agua) en dos tubos de ensayo. En el tubo de ensayo izquierdo se depositaron a continuación 10 ml de aceite de oliva. En el derecho se agregaron 2 cucharadas de espátula de mantequilla.