Which structure allows upper respiratory infections to spread from the throat to the tympanic cavity?
A) Auditory canal
B) Oval window
C) Cochlear duct
D) Tympanic cavity
E) Auditory (Eustachian) tube
E
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The mesenteric arteries branch off the abdominal aorta, but the mesenteric veins do not connect directly to the vena cava. Why?
What will be an ideal response?
An average value for vital capacity in healthy young adult males is ________
A) 3000 ml B) 4800 ml C) 6000 ml D) 500 ml
What triggers the release of parathyroid hormone (PTH)?
A) decreasing sodium ion concentration of the blood B) increasing calcium ion concentration of the blood C) increasing potassium ion concentration of the blood D) decreasing calcium ion concentration of the blood
The pseudostratified columnar epithelium of the bronchi in smokers may transform into stratified squamous epithelium. This is an example of ________.
A. neoplasia B. hyperplasia C. atrophy D. metaplasia E. differentiation