Physiology of Labour

Question 1

Prostagladins can be given to induce labour. Why?

Answer 1

Ready cervix and play role in the onset of labour

They stimulate vigorous contractions of uterus

Question 2

Explain how the balance between oestrogen and progesterone can control contractibility of uterus

Answer 2

Progesterone inhibits
Oesterogen increases

Progesterone levels drop off just before labour

Question 3

What hormone is produced by the posterior pituitary gland that increases contractions and excitability?

When is this produced?

Answer 3

Oxytocin

Once membranes have been ruptured and on cervical stretch

Question 4

What are Braxton Hicks contractions?

Answer 4

‘practice’ mild contractions that occur in the later stages of pregnancy

Infrequent and don’t require pain relief

Question 5

What hormones cause ‘cervical ripening’?

Answer 5

Cervical ripening is the softening of the cervix ready for dilation

Prostagladins
Oesterogen
Relaxin