Question 19N.2.HL.TZ0.7a
| Date | November 2019 | Marks available | [Maximum mark: 4] | Reference code | 19N.2.HL.TZ0.7a |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Outline | Question number | a | Adapted from | N/A |
Outline the reasons for the differences in blood concentrations between the renal artery and the renal vein.
[4]
a. urea/waste products lower in vein due to excretion «in urine»/ultrafiltration but not reabsorption ✔
b. oxygen lower in vein due to use in cell respiration/in kidney tissue ✔
c. carbon dioxide higher in vein due to production by cell respiration/excretion by kidney cells ✔
d. glucose lower in vein due to use in cell respiration «by kidney tissue» ✔
e. sodium/chloride/ion concentrations changed due to production of hypertonic/hypotonic urine
OR
sodium/chloride/ion concentrations lower due to removal of excess ✔
f. ion/solute concentrations lower in vein than artery if ADH has been secreted
OR
ion/solute concentrations in vein vary depending on amount of water reabsorbed in the collecting duct ✔
g. drug/toxin concentrations lower in vein due to excretion in urine ✔
Accept any point given as the converse.
Each mark point includes a difference and reason for it.
