quinta-feira, junho 02, 2005

Coordenação Hormonal e Termorregulação ( texto de Tânia Santos )

Na aula de dia 25 de Maio falámos sobre a coordenação hormonal e da termorregulação.
As hormonas são proteínas produzidas por glândulas endócrinas em que são lançadas directamente no sangue, transportando uma informação, ou seja, uma “ordem” para as células. As hormonas apenas actuam em células de certos órgãos, designados por células-alvo que são receptores específicos para uma dada hormona.
Resolvemos a actividade 3 da página 209 do manual relativa as hormonas.
Relativamente à termorregulação, qualquer variação significativa da temperatura do ambiente pode causar nos animais uma mudança na temperatura do meio interno. A temperatura influencia as reacções químicas metabólicas.
Resolvemos a actividade 5 da página 212 do manual relativa aos animais e variações de temperatura.
A termorregulação é um conjunto de mecanismos que permitem a manutenção da temperatura do corpo. Em relação à fonte principal de calor, os organismos podem classificar-se em:
 Endotérmicos – a temperatura do corpo, praticamente constante, depende da taxa metabólica.
 Ectotérmicos – a temperatura do corpo depende de fontes externas de calor, ou seja, varia em função da temperatura do meio exterior.
A termorregulação é controlada pelo sistema nervoso e também, por vezes, pelo sistema hormonal. Concluímos a aula com a interpretação do esquema da actividade 6 da página 215 do manual.

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