Uterine endometrium, epithelial glands and connective tissue are broken in menstrual phase. This is due to
Over secretion of $FSH$
Lack of oestrogen
Lack of progesterone
Over production of progesterone
Which of the following structure originates from ectoderm
The central nervous system develops as a result of
The only human system that is derived from all the three germ layers is
Which of these sets of cells divide slowly
Which part of ovary in mammals acts as an endocrine gland after ovulation?