The main power in delivery is: () A: Uterine contraction B: Abdominal muscles and C: diaphragm contraction D: levator ani muscle contractility E: The psyche

The main productive force in childbirth is A: Uterine contractility B: Diaphragm contractility C: Levator ani muscle contractility D: Abdominal muscle contractility

Which of the following extraocular muscles does not originate from Zinn's tendon ring? A: Inferior oblique muscle B: Levator palpebrae superioris muscle C: Superior rectus muscle D: Superior oblique

The factors affecting delivery are ( ). A: uterine action B: birth canal C: uterine contractility (rhythmicity, symmetry, polarity, retraction<br/>effect) D: contractility of abdominal wall muscle and diaphragm and<br/>contractility of levator ani muscle