MCQ
The $QRS$ complex in a standard $ECG$ represents:
- ARepolarisation of ventricles
- BRepolarisation of auricles
- CDepolarisation of auricles
- ✓Depolarisation of ventricles
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$(i)$ Mouth opens into a short tubular pharynx, leading to a narrow tubular passage called oesophagus.
$(ii)$ Gizzard helps in grinding the food particles.
$(iii)$ A ring of $6-8$ blind tubules called hepatic or gastric caecae is present at the junction of foregut and midgut, which secrete digestive juice.
$(iv)$ At the junction of midgut and hindgut is present another ring of $100-150$ yellow coloured thin filamentous malphigian tubules which help in removal of excretory products from haemolymph.