Given below are the steps involved in parturition. Arrange them in proper sequence and select the correct option.
I. The induction of mild uterine contractions is called foetal ejection reflex.
II. Stronger uterine contractions causing the further release of oxytocin. III. Origination of signals from the fully developed foetus and placenta.
IV. Release of oxytocin from maternal pituitary
V. Expulsion of baby from the birth canal

Options

A. III , IV , I , II , V
B. III, I , IV , II , V
C. I, III , II , IV ,V
D. II , IV , III, I,V

Answer

To solve the question regarding the sequence of steps involved in parturition, we need to arrange the given steps in the correct order. Here’s the step-by-step solution:

### Step-by-Step Solution:

1. **Identify the Initial Trigger**: The process of parturition begins with the signals originating from the fully developed fetus and the placenta. This is the first step in the sequence.
- **Correct Step**: III. Origination of signals from the fully developed foetus and placenta.

2. **Mild Uterine Contractions**: The signals from the fetus and placenta induce mild uterine contractions, known as the fetal ejection reflex.
- **Correct Step**: I. The induction of mild uterine contractions is called foetal ejection reflex.

3. **Release of Oxytocin**: The contractions of the uterus stimulate the maternal pituitary gland to release oxytocin.
- **Correct Step**: IV. Release of oxytocin from maternal pituitary.

4. **Stronger Uterine Contractions**: The release of oxytocin causes stronger uterine contractions, which further promote the release of more oxytocin.
- **Correct Step**: II. Stronger uterine contractions causing the further release of oxytocin.

5. **Expulsion of the Baby**: Finally, the strong contractions lead to the expulsion of the baby from the birth canal.
- **Correct Step**: V. Expulsion of baby from the birth canal.

### Final Sequence:
The correct order of steps is:
1. III
2. I
3. IV
4. II
5. V

### Correct Option:
Based on the sequence, the correct option is **B**.