Discuss the factors that influence filtration across the glomerular basement membrane.
It was expected this answer would involve discussion about membrane structure, the unique
blood vessel structure (afferent and efferent arterioles allowing a high net pressure to be
maintained) and Starlings forces all influencing ultrafiltation. Better answers included comment
on mesangial cells contraction to decrease surface area ( caused by angiotensin 2). Details
regarding molecular weight cut offs (> 7000 Da are not filtered freely) gained additional credit.