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171237 Physiology

The force of a twitch is less than that in a tetanus, BECAUSE:

AOne action potential does not release sufficient Ca++ to saturate the troponin binding sites
BCa++ reuptake into the sarcoplasmic reticulum is so rapid that there is insufficient time for all the troponin Ca++ -binding sites to be occupied
CCrossbridge cycling is not fast enough to allow expression of the maximum possible force before Ca++ dissociates from troponin (Correct Answer)
DAll of the above
171243 Surgery

Hpylori

AGram -ve non flagellate spiral organism
Bobligate parasite on gastric mucosa (Correct Answer)
CDoesnot infection duodenal mucosa
DAntibiotics not effective