USMLE Forum Archives - USMLE Step 1 - salivary secretions
salivary secretions
drspleen - 03-17-11 18:02
A hungry man walks into a fast-food restaurant and immediately begins salivating. Which of the following most accurately describes the tonicity of his salivary secretions?
* A. Isotonic and hypotonic
* B. Isotonic
* C. Hypertonic
* D. Hypotonic
* E. Hypotonic and hypertonic
drspleen - 03-17-11 18:02
A hungry man walks into a fast-food restaurant and immediately begins salivating. Which of the following most accurately describes the tonicity of his salivary secretions?
* A. Isotonic and hypotonic
* B. Isotonic
* C. Hypertonic
* D. Hypotonic
* E. Hypotonic and hypertonic
The correct answer and explanation will be available after you answer.
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#3
Re: salivary secretions babbu5508 - 03-18-11 18:50 My answer is: b.
The saliva starts out isotonic (before any modifications are made in the duct)
-Low flow rate= hypotonic because the ductal cells have more time to pump Na, Cl out (H2O stays)
-High flow rate= closer to isotonic because the fluid spends less time in the lumen of the duct, so less time for ions to be pumped out
#4
Re: salivary secretions sudha2015 - 03-19-11 10:26 A hungry man walks into a fast-food restaurant and immediately begins salivating. Which of the following most accurately describes the tonicity of his salivary secretions?
* A. Isotonic and hypotonic
* B. Isotonic
* C. Hypertonic
* D. Hypotonic
* E. Hypotonic and hypertonic
b
#5
Re: salivary secretions
drspleen - 03-21-11 18:36 Rapid secretion of saliva results in isotonic saliva, whereas slow secretion is hypotonic.
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