Biology AQA A level common
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give two factors other than age and gender that would affect the concentration of creatinine in the blood ? 
muscle/ body mass 
ethnicity 
Explain how the cells of the collecting duct are able to absorb water from the filtrate through the protein channels in their plasma membranes? 
lower w.p/ more negative inside tubule cells so h2o enters by osmosis 
Suggest why diabetes insipidus is more common in males ? 
Bc males only have X chromosome do not have Y chromosome single copy of recessive allel...