Question

2) a) How does the osmotic concentration in lung cells differ in people with cystic fibrosis versus in those without cystic fibrosis? Is the extracellular solution of the lung cell hypertonic, hypotonic or isotonic? Elaborate
b) Why is maintaining the osmotic concentration important in a lung cell? What factors contribute to its regulation? [Chapter 5]

Answer 1

Answer:

Ansa) The CFTR gene provides instructions for making a protein called the cystic fibrosis transmembrane conductance regulator. This protein functions as a channel across the membrane of cells that produce mucus, sweat, saliva, tears, and digestive enzymes.

Ansb) By diffusion of water or solutes, osmotic balance ensures that optimal concentrations of electrolytes and non-electrolytes are maintained in cells, body tissues, and in interstitial fluid. Solutes or water move across a semi-permeable membrane, causing solutions on either side of it to equalize in concentration.

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