Structure and function of the velar muscle in the New Zealand hagfish Eptatretus cirrhatus: response to temperature change and hypoxia.
J Fish Biol
; 79(1): 280-9, 2011 Jul.
Article
em En
| MEDLINE
| ID: mdl-21722124
ABSTRACT
The rate of velar movement in Eptatretus cirrhatus, as determined by electromyography, increased with Q(10) 3·2 during exposure to temperatures between 7 and 19° C and increased 3·9 fold during exposure to hypoxia (oxygen partial pressure = 6·67 kPa). This confirms the role of the velum in generating respiratory currents and modification of its activity in response to changes in metabolic demand or environmental oxygen availability. The maximum velar rate observed was 168 beats min(-1) , higher than that recorded in any hagfish species to date. Fibres of musculus craniovelaris were exclusively small, red (slow-twitch) fibres, consistent with a high aerobic capacity required by fibres involved in rhythmic, ongoing activity.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Temperatura
/
Feiticeiras (Peixe)
/
Hipóxia
/
Músculos
Limite:
Animals
País/Região como assunto:
Oceania
Idioma:
En
Revista:
J Fish Biol
Ano de publicação:
2011
Tipo de documento:
Article