true or false

Question

1) The activity of the central chemoreceptors would increase upon breathing a gas mixture containing 18% O2 and 82% N2. 3)

 

2) Most of the filtrate formed in the renal corpuscle is reabsorbed from the collecting ducts of the kidney.

 

Answer 1

1) Normal air is about 20% O₂ so a small decrease in oxygen levels would have virtually no effect on central chemoreceptors.

 

2) Over half the filtrate is reabsorbed in the proximal convoluted tubule, and at most 10% is reabsorbed in the collecting duct.