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

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

The factors enhancing contractility of muscle are () A: Ca2+ B: caffeine C: adrenaline D: hypoxia E: acidosis

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 stroke volume is mainly regulated by A: Preload of the ventricle B: Afterload of the ventricle C: Contractility of the ventricle D: Heart rate E: Tone of the vagus nerve

When furosemide is administered to a patient with acute pulmonary edema, there is often symptomatic relief within 5 minutes of starting treatment. This relief is primarily due to A: a rapid diuretic effect B: a direct effect on myocardial contractility C: psychological effects D: an increase in venous capacitance

Which<br/>of the followings is the main mechanism of decreased myocardial<br/>contractility induced by acidosis, hyperkalemia?() A: myocardial<br/>energy generation disorder B: myocardial<br/>energy utilization disorder C: myocardial<br/>energy storage disorder D: disorder<br/>of excitation-contraction coupling E: contractive<br/>proteins destruction of myocardium