1.Human anatomyMedium
Which artery is most commonly used to feel the pulse at the wrist?
- AAxillary artery
- BBrachial artery
- CUlnar artery
- DRadial artery
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
A stroke affecting the left middle cerebral artery in a right-handed person most likely causes:
- AIsolated loss of balance
- BRight-sided weakness and left visual neglect
- CRight-sided weakness and aphasia
- DLeft-sided weakness and aphasia
3.Human physiologyMedium
Which receptors respond mainly to a fall in arterial oxygen levels?
- ABaroreceptors in the carotid sinus
- BCentral chemoreceptors in the medulla
- CStretch receptors in the lungs
- DPeripheral chemoreceptors in the carotid and aortic bodies
4.Human physiologyHard
Which substance's clearance is used as the gold standard to measure glomerular filtration rate?
- AInulin
- BGlucose
- CCreatinine
- DUrea
2Solutions
1.Human anatomy
Answer: D · Radial artery
Why this is the answer
The radial artery lies superficially on the thumb side of the wrist, against the radius, which makes the pulse easy to feel.
Answer
D · Radial artery
2.Human anatomy
Answer: C · Right-sided weakness and aphasia
Why this is the answer
The left MCA supplies the left motor cortex (face and arm of the right side) and Broca's and Wernicke's areas, so right hemiparesis with aphasia is typical.
Answer
C · Right-sided weakness and aphasia
3.Human physiology
Answer: D · Peripheral chemoreceptors in the carotid and aortic bodies
Why this is the answer
The carotid and aortic bodies detect low PaO₂ (and also high CO₂ and H⁺). The central chemoreceptors respond to CO₂ but not directly to oxygen.
Answer
D · Peripheral chemoreceptors in the carotid and aortic bodies
4.Human physiology
Answer: A · Inulin
Why this is the answer
Inulin is filtered freely and is not reabsorbed or secreted, so its clearance equals GFR exactly. Creatinine is slightly secreted, so it overestimates GFR a little.
Answer
A · Inulin
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