Question Detail
Question
The placenta in mammals secretes
Correct Answer
Option D is the correct answer.
Detailed Explanation
The placenta in mammals is an endocrine organ that secretes multiple hormones to maintain pregnancy. These include progesterone (maintains the uterine lining), estrogens (estradiol) (stimulate uterine growth and prepare for lactation), and relaxin (relaxes the pelvic ligaments and softens the cervix for parturition).
Hint
The placenta produces a combination of steroid and peptide hormones essential for pregnancy maintenance and delivery.