MCQ
The secretin promotes the release of
- A$HCl$ and sodium carbonate ions
- B$HCl$ and bicarbonate ions in gastric juice
- ✓Water and bicarbonate ions in pancreatic juice
- DPancreatic enzymes and mucus
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Select the correct answer from the options given below.
$(a) -(b)- (c)- (d)$

$I.$ Each myosin is a polymerized protein
$II.$ Many meromyosin constitutes one thick filament (myosin)
$III.$ Each meromyosin's tail is called heavy meromyosin $(HMM)$ and head is called light meromyosin $(LMM)$
$IV.$ The globular head is an active $ATP$ ase enzyme and has binding sites for $ATP$ and active sites for actin
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