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Dierziekten gezelschapsdieren - Samenvatting L2 - oog & oor

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Dierziekten gezelschapsdieren - Samenvatting L2 - oog & oor

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Uploaded on
June 23, 2023
Number of pages
15
Written in
2022/2023
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DZ Les 2 – Oog, oor, ademhaling

OOG
Werking van het oog
Vul de onderstaande nummering in, incl. de eventuele Latijnse namen


1
2
3

4
5




1. bindvlies / conjunctiva
2. netvlies / retina
3. pupil
4. hoornvlies / cornea
5. iris


Wat hebben de ogen van hond/kat, dat een mensen en primaten niet hebben?
Tapetum lucidum = reflector
Beter zicht, zeker ‘s nachts




Zien honden en katten beter in het donker dan mensen?
Ja  Tapetum lucidum + meer staafjes
Honden 5 x beter / Katten 6-8 x beter

, Wat kan je terugvinden in het netvlies en voor wat dienen ze?
Staafjes: detecteren kleurintensiteit (’s nachts)
Kegeltjes: kleur zien



Zijn honden en katten bijziend?
Ja, dicht = scherp, ver = wazig


Mens




Hond / kat




Waarom kunnen honden dan vb. een tennisbal vlak voor hun neus zo moeilijk zien?
Limiet aan bol worden vd lens
Hond: dichter dan 33-50 cm = niet meer scherp zien
Mens: dichter dan 7-10 cm = niet meer scherp zien



Zijn honden en katten kleurenblind?
Nee
Honden: 2 kegeltjes  groen, blauw
Katten: 3 kegeltjes  groen, blauw, 1 kegeltje omgevormd voor scherpzien ’s nachts
Mensen: 3 kegeltjes  groen, blauw, rood




Wanneer gaan de oogjes van pups en kittens open?
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