Some resources that might help with Problem II:Guts
Msba, a bacterial channel that ressembles the CFTR chloride channel in cystic fibrosis
(you'll need the Chime plugin to see this) (MSBA)
Introduction and overview of digestion:
National Digestive Diseases Information Clearing House, part of the
National Institute of Diabetes and Digestive and Kidney Diseases
National Institutes of Health Genes and Disease site.
Look under digestive or nutritional and metabolic diseases.
A commercial site with links for the medical community
Ion channel diseases
Thiamin at the Pauling Institute Micronutrient Center
Action Potential Simulation