As blood passes through CO2 producing tissues which of the f
     As blood passes through CO_2 producing tissues, which of the following should increase in the concentration in the blood?  CO_2  H^+  HCO_3  Two of these.  All of these.  The main purpose of the Loop of Henle is to  create a concentration gradient in the extracellular fluid  concentrate the filtrate by reabsorbing lots of water  reabsorb all of the important nutrients still in the filtrate  alter the pH of the  secretion of metabolic by-products from the vasa recta into the filtrate  If a person decreases his ventilation rate, then in his blood  O_2 will rise, CO_2 will rise, and H^+ will rise.  O_2 will fall, CO_2 will rise, and H^+ will rise.  O_2 will rise, CO_2 will fall and H^+ will fall  O_2 will fall, CO_2, will fall and H^+ will rise. 
  
  Solution
3. All of these.
As blood receives CO2 from tissues, dissolved CO2 in blood reacts with H2O to form Cabonic acid (H2CO3). It disocaited into H+ and HCO3-.
4. Concentrate filetrate by reabsorbing lots of water.
5 O2 will fall,CO2 will rise and H+ will rise.

