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Normal parturition depends on 

A. An abrupt fall in placental secretion of oestrogen and progesterone. 

B. Release of oxytocin from the posterior pituitary gland. 

C. Activation of beta adrenoceptors in uterine muscle. 

D. The presence of normal ovaries. 

E. Innervation of the uterus.

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A. False Secretion is maintained at high levels until parturition. 

B. False Birth can occur in the absence of the posterior pituitary. 

C. False Beta activation may be used to delay onset of labour. 

D. False Ovaries are not essential in late pregnancy and parturition. 

E. False Parturition can occur with a denervated uterus; the cause of the onset of normal labour is unknown.

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