MCQ – 73757

All of the following are true about the basal electrical rhythm of intestines except:

A.	The tone of contraction is related to the amplitude of the stimulus
B.	The tone of contraction is related to the frequency of stimulation
C.	Frequency of contraction is 6 per minute
D.	The threshold of contraction is -50 mV

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Correct Answer � B Explanation

Ans:B-The tone of contraction is related to the frequency of stimulation

• Tone of contraction depends on stimulus frequency rather than amplitude.

Threshold for action potential:

• Upto 50 mV (I.e. potential required to trigger an action potential & contraction).

• One contraction in 10 seconds implies frequency is 6 contractions/minute.