Which hormone is secreted by the corpus luteum and helps in the maintenance of pregnancy?
Progesterone, secreted by the corpus luteum, helps maintain pregnancy by supporting the uterine lining. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Human Physiology - Digestion, Respiration, Circulation, Neural Control and Chemical Coordination, Topic: Organ system functions and hormonal regulation.