1.Human anatomyMedium
Which nerve is compressed in carpal tunnel syndrome?
- AMusculocutaneous nerve
- BUlnar nerve
- CRadial nerve
- DMedian nerve
Anatomy and Physiology: cram pack
Formula sheets, the key method steps for every topic and 4 practice problems, with full solutions at the back.
1Practice problems
2.Human anatomyHard
When a patient stands on the right leg only, the left side of the pelvis drops (positive Trendelenburg sign). Which nerve is most likely damaged?
- ARight superior gluteal nerve
- BRight femoral nerve
- CLeft superior gluteal nerve
- DRight inferior gluteal nerve
3.Human physiologyMedium
Low plasma albumin, as in severe liver disease, causes oedema mainly because:
- ACapillary hydrostatic pressure falls
- BPlasma oncotic pressure falls
- CLymphatic drainage increases
- DThe capillaries become impermeable
4.Human physiologyHard
Constriction of the efferent arteriole of a glomerulus, with the afferent arteriole unchanged, tends to:
- ARaise glomerular capillary pressure and GFR
- BLower glomerular capillary pressure and GFR
- CHave no effect on GFR at all
- DStop filtration completely
2Solutions
1.Human anatomy
Answer: D · Median nerve
Why this is the answer
The median nerve passes through the carpal tunnel under the flexor retinaculum; compression causes tingling in the thumb, index and middle fingers.
Answer
D · Median nerve
2.Human anatomy
Answer: A · Right superior gluteal nerve
Why this is the answer
The superior gluteal nerve supplies gluteus medius and minimus. If those of the standing (right) leg are weak, the pelvis sags on the opposite, unsupported side.
Answer
A · Right superior gluteal nerve
3.Human physiology
Answer: B · Plasma oncotic pressure falls
Why this is the answer
Albumin generates most of the plasma oncotic pressure that pulls fluid back into capillaries. When it falls, more fluid stays in the tissues.
Answer
B · Plasma oncotic pressure falls
4.Human physiology
Answer: A · Raise glomerular capillary pressure and GFR
Why this is the answer
Efferent constriction holds blood in the glomerulus, raising its pressure and GFR. Angiotensin II acts this way, which is why ACE inhibitors can lower GFR.
Answer
A · Raise glomerular capillary pressure and GFR
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