Which structure connects the middle ear to the nasopharynx?
- ACochlear duct
- BNasolacrimal duct
- CAuditory (Eustachian) tube
- DExternal acoustic meatus
Formula sheets, the key method steps for every topic and 4 practice problems, with full solutions at the back.
Which structure connects the middle ear to the nasopharynx?
In portal hypertension, oesophageal varices form at which portosystemic anastomosis?
Why does glucose appear in the urine in uncontrolled diabetes mellitus?
At the start of a fever, a patient shivers and feels cold even though body temperature is rising. Why?
Answer: C · Auditory (Eustachian) tube
The auditory tube equalises air pressure on both sides of the eardrum. In children it is shorter and more horizontal, which favours middle ear infections.
Answer: A · Between the left gastric vein and the oesophageal tributaries of the azygos vein
At the lower oesophagus, portal blood in the left gastric vein meets systemic blood in the oesophageal veins draining to the azygos system. High portal pressure dilates these veins.
Answer: B · The filtered load exceeds the tubular transport maximum
Proximal tubule SGLT carriers can reabsorb only so much glucose. When plasma glucose is high, the filtered load exceeds this maximum and the excess is excreted.
Answer: B · Pyrogens raise the hypothalamic set point above the current body temperature
Pyrogens trigger prostaglandin E₂ in the hypothalamus, raising the set point. Until body temperature reaches the new set point, heat-gain responses such as shivering occur.
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