1. What is the osmotic concentration of a solution containing300 mM NaCl and 100 mM glucose? Is it iso-, hypo-, or hyper-osmolar?
| A. | 700 mOsm/L, hyper-osmolar |
| B. | 600 Osm/L, iso-osmolar |
| C. | 200 Osm/L, hypo-osmolar |
| D. | 400 mOsm/L, hyper-osmolar |
2. Ocean water has a high salt concentration compared to bodyfluids. If you were adrift at sea drinking seawater will not helpyou, and may make you even more dehydrated! What explains this?
| A. | Water diffuses from body tissues into the intestines because ofthe higher osmolarity of seawater. |
| B. | Waste contaminants in seawater clog pores in intestinalepithelial cells, thereby blocking water absorption. |
| C. | Water is actively pumped by the intestinal epithelial cells intothe body from the intestine. This requires enormous amounts of ATP(active transport) and the waste products are osmolytes. |
| D. | Seawater is hypertonic and that makes cells swell. |
3.   What you predict the concentration of Na+,K+, and Ca2+ in a T cell to be?
A.130 mM Na+, 3.5 mM K+, and 2.4 mM Ca2+
B.4 mM Na+, 70 mM K+, and 0.4 µM Ca2+
C. 140 mM, 5.2 mM, and 0.2 mM
D. 9.5 mM Na+, 140 mM K+, and 0.1 µM Ca2+
