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Samenvatting 10 Voor Biologie - Hoofdstuk 20: Zintuigen $3.25   Add to cart

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Samenvatting 10 Voor Biologie - Hoofdstuk 20: Zintuigen

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Samenvatting 10 Voor Biologie - Hoofdstuk 20: Zintuigen. In dit hoofdstuk wordt er kort gesproken over de neus en oor. Bij de ogen wordt er meer uitleg gegeven over bijvoorbeeld staafjes en kegeltjes.

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  • November 16, 2022
  • 3
  • 2019/2020
  • Summary
  • Secondary school
  • 4
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Hoofdstuk 20 – Zintuigen
20.1 – De zintuigen
Zintuigen → receptoren/sensoren → waarnemen → prikkel → impuls →centra in de
hersenschors
4 typen receptoren:
 Chemische receptoren:
o Gevoelig voor verandering van de chemische samenstelling rond cellen
 Mechanische receptoren:
o Geprikkeld door een verandering van eigen celvorm
 Temperatuurreceptoren:
o Registreren temperatuurveranderingen
 Lichtreceptoren (fotosensoren)
o Licht is de prikkel voor deze zintuigcellen

Adequate prikkel = elk type receptor is gevoelig voor een bepaald soort prikkel
20.1.1 – De neus
Reukslijmvlies → chemische receptoren
Ingeademde lucht → reukslijmvlies → chemische verbinding met trilharen → prikkel →
impuls → centrale zenuwstelsel
20.1.2 – Het oor
2 typen mechanische receptoren
 Buitenoor = prikkel opvangende gedeelte
 Middenoor = prikkelgeleidende gedeelte
 Binnenoor = prikkel verwerkende gedeelte
Evenwichtszintuig = 3 halve cirkelvormige kanalen met vocht en kristallen
(gehoorsteenjes/otolieten)
20.1.3 – De tong
Smaakpapil → zout, zoet, bitter, zuur en umami proeven

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