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1825192
Communication Systems
Descrição
A level Biology Mapa Mental sobre Communication Systems, criado por beccadavies19 em 30-12-2014.
Sem etiquetas
biology a2 ocr
biology
communication systems
a2
ocr
f214
module 1
2014
biology
a level
Mapa Mental por
beccadavies19
, atualizado more than 1 year ago
Mais
Menos
Criado por
beccadavies19
quase 10 anos atrás
54
2
0
Resumo de Recurso
Communication Systems
External Environment
Can be air, water or soil. It can change and put the organism under stress
Slow changes e.g. Season change/global warming
Fast change e.g. Day to night/sunshine to darkness
Detecting changes
High blood sugar levels after a meal
Body releases insulin - hormonal
Smelling delicious food
Mouth waters - nervous
Torch shone in eye
Pupils contract - nervous
Sudden drop in external temperature
Shiver - nervous
Internal Environment
Cells...
...do metabolic reactions, use up substrates and produce products e.g. CO2
CO2 needs excreting
This means the removal of waste to prevent accumulation in the blood
CO2 needs excreting as it can build up in tissue fluid ad disrupt enzyme action of cells, and change pH levels
...are bathed in tissue fluid which is made from the blood
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