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Sense organs (Eyes and tongue)
Содержание
- 1. Sense organs (Eyes and tongue)
- 2. TongueThe tongue is one of the most important organs of speech and nutrition
- 3. TongueThe surface of the tongue is covered
- 4. Tongue regionsSweet foods are tasted at the
- 5. The Human EyeIt consists of two main structures: an eye sphere and accessory structures
- 6. Слайд 6
- 7. The structure of the eye sphereIt consists of:ScleraChoroidRetina
- 8. ScleraThe part of the sclera in front
- 9. ChoroidJust inside the sclera is the choroidThis
- 10. ChoroidThe diameter of iris is related to
- 11. RETINAInnermost layer of the eye, the retina
- 12. VISIONLight entering the eye passes through the
- 13. VISIONCones are sensitive to colorRods are sensitive
- 14. Слайд 14
- 15. Слайд 15
- 16. Myopia (nearsightedness) - близорукостьThe light rays focus
- 17. Hypermetropia (farsightedness) - дальнозоркостьLight focuses behind the
- 18. Скачать презентанцию
TongueThe tongue is one of the most important organs of speech and nutrition
Слайды и текст этой презентации
Слайд 3Tongue
The surface of the tongue is covered with small projections
called papillae
There are the taste receptors or taste buds within
the papillae
Слайд 4Tongue regions
Sweet foods are tasted at the tip of the
tongue, whereas bitter foods are tasted at the rear
Sour and
salty foods are simultaneously tasted on both sides of the tongueSalt and sour
Salt and sour
Bitter
Sweet
Слайд 8Sclera
The part of the sclera in front of the eye
is called the cornea
It allows entering of light
The lens plays
an important role in focusing the light onto the proper photoreceptors
Слайд 9Choroid
Just inside the sclera is the choroid
This layer contains many
blood vessels
At the front of eye the choroid layer forms
the irisIris is colored part of eye
In the centre of the iris is an opening called PUPIL
Слайд 10Choroid
The diameter of iris is related to the amount of
light
It narrows under intense (bright) light but widens in dark
(dim light) conditionsThe size of pupil is controlled automatically by nervous system
Слайд 11RETINA
Innermost layer of the eye, the retina contains the light
receptor
At the rear of the eye, the retina is attached
to the optic nerve which carries impulses from the light sensitive cells to the brain
Слайд 12VISION
Light entering the eye passes through the cornea, pupil, lens
and forms an image on the retina
Retina contains light sensitive
cells which are called cones and rod
Слайд 13VISION
Cones are sensitive to color
Rods are sensitive to light, but
not to color (black and white)
The retina contains 125 million
rods and 6,5 million cones
Слайд 16Myopia (nearsightedness) - близорукость
The light rays focus in front of
retina
Close objects are seen clearly
This condition can be corrected
by wearing glasses or contact lenses with concave lenses
Слайд 17Hypermetropia (farsightedness) - дальнозоркость
Light focuses behind the retina
Far things are
seen better
This can be corrected with convex lenses
