MEASUREMENT OF RENAL BLOOD FLOW
Q. 1
How much of blood flows through the kidneys?
| A |
1-1.5 L/min |
|
| B |
1.5-2 L/min |
|
| C |
2-2.5L/min |
|
| D |
2.5-3 L/min |
Q. 1
How much of blood flows through the kidneys?
| A |
1-1.5 L/min |
|
| B |
1.5-2 L/min |
|
| C |
2-2.5L/min |
|
| D |
2.5-3 L/min |
Ans.
A
D
C
Explanation:
1-1.5 L/min.
- The total renal blood flow (RBF) is approximately 1.1-1.3 Lit/min.
- i.e.,22-25% of cardiac output.
Q. 2
Two substances that can probably be used to determine filtration fraction are
| A |
Insulin and mannitol |
|
| B |
Urea & diodrast |
|
| C |
PAH and phenol red |
|
| D |
Inulin and PAH |
Q. 2
Two substances that can probably be used to determine filtration fraction are
| A |
Insulin and mannitol |
|
| B |
Urea & diodrast |
|
| C |
PAH and phenol red |
|
| D |
Inulin and PAH |
Ans.
Explanation:
Inulin and PAH.
- Filtration fraction – GFR/renal plasma flow.
- Again, GFR is measured by inulin and renal plasma flow is measured by PAH.
Q. 3
In humans, effective renal blood flow is
| A |
425 |
|
| B |
525 |
|
| C |
625 |
|
| D |
725 |
Q. 3
In humans, effective renal blood flow is
| A |
425 |
|
| B |
525 |
|
| C |
625 |
|
| D |
725 |
Ans.
Explanation:
625
Measure of Effective Renal Plasma Flow (ERPF):
- Is through PAH clearance
- In normal adult is about 625 ml/minute
- However, PAH underestimates the effective renal plasma flow by about 10%.
- Therefore, actual renal plasma flow is about 700 ml/min.
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