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,Contents4 primaire weefsels in menselijk lichaam:...........................................................3
............................................................................................................................ 3
Prikkelbaar vs. niet- prikkelbaar:.........................................................................3
1. Epithelen.......................................................................................................... 3
1.1. Dekweefsel/ dekepitheel............................................................................5
1.2. Klierweefsel/ klierepitheel..........................................................................7
1.2.1. Exocriene endocriene klieren..........................................................8
1.3. Zintuigweefsel/ zintuigepitheel..................................................................8
2. Steunweefsels.................................................................................................. 9
2.1. Bindweefsel............................................................................................. 10
2.1.1. Losmazig (ijl) bindweefsel)................................................................10
2.1.2. Straf bindweefsel............................................................................... 10
2.1.3. Elastisch bindweefsel........................................................................11
2.2. Vetweefsel............................................................................................... 11
2.3. Kraakbeenweefsel.................................................................................... 12
2.3.1. Samenstelling:................................................................................... 12
2.3.2. Eigenschappen:................................................................................. 12
2.3.3. Functies:............................................................................................ 12
2.3.4. Soorten:............................................................................................. 13
2.4. Botweefsel............................................................................................... 13
2.4.1. Samenstelling:................................................................................... 13
2.4.2. Ontstaan van botweefsel uit:.............................................................13
2.4.3. Functie:.............................................................................................. 14
2.4.4. Soorten botten:................................................................................. 14
2.4.5. Soorten botweefsel:...........................................................................14
2.5. Bloed........................................................................................................ 16
2.6. Rood beenmerg....................................................................................... 16
3. Zenuwweefsels en impulsvorming/ geleiding/ transmissie............................17
3.1. neuron..................................................................................................... 17
3.2. Soorten gliacellen (ondersteunen de neuronen)......................................18
3.2.1. Astrocyten:........................................................................................ 19
3.2.2. Oligodendrocyt:................................................................................. 19
3.2.3. Microgliacel:...................................................................................... 19
, 3.2.4. Ependymcellen:................................................................................. 19
3.3. opbouw van een zenuw...........................................................................19
3.4. Het ontstaan, geleiden en verwerken van zenuwimpulsen......................20
3.4.1. Ontstaan van een zenuwimpuls: wat?...............................................20
3.4.2. Voortplanting van zenuwimpuls: hoe?...............................................22
3.4.3. Transmissie van een zenuwimpuls: hoe?...........................................22
3.4.4. Fysiologie van het neuron: resumé....................................................23
4. Spierweefsel en spiercontractie.....................................................................25
4.1. Dwars gestreept (skeletspierweefsel).....................................................25
4.1.1. myofibrillen....................................................................................... 26
4.1.2. Fysiologie van de spiercontractie: wat gaat vooraf?..........................27
4.2. Glad spierweefsel.................................................................................... 28
4.3. Hart.......................................................................................................... 28
, 4 primaire weefsels in menselijk lichaam:
Prikkelbaar vs. niet- prikkelbaar:
- Niet-prikkelbare cellen/ weefsels
o kennen slechts 1 toestand, zijnde de ‘rust’-toestand
- (Selectief) prikkelbare cellen/ weefsels
o kennen een rusttoestand
o slaan om in een aangeslagen (actie-) toestand bij blootstelling
aan de gepaste prikkel (aan voldoende intensiteit)
zintuigcel ontlaadt en scheidt neurotransmittor (zie
verder) af bij het opvangen van een prikkel
zenuwcel geleidt zenuwimpulsen (zie verder) bij
blootstelling aan welbepaalde neurotransmittoren
spiercel contraheert (zie verder) na zenuwimpuls
kliercel scheidt stoffen af na zenuwimpuls of hormonale
(zie verder) blootstelling
1. Epithelen
Functie:
- Deze groep weefsels bedekt het lichaam en bekleedt lichaamsholten,
holle organen en de verschillende doorgangen (kanalen, buizen en
buisjes) van het lichaam.
- Ook bevindt het zich in klieren.
De structuur:
- wordt bepaald door de funcite ervan, die kan zijn:
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