Which of the following secretes the hormone, relaxin, during the later phase of pregnancy?
1. Foetus
2. Uterus
3. Graafian follicle
4. Corpus luteum
Which of these is not an important component of initiation of parturition in humans?
1. Release of oxytocin
2. Release of prolactin
3. Increase in estrogen and progesterone ratio
4. Synthesis of prostaglandins
Receptors for sperm binding in mammals are present on:
1. | Perivitelline space | 2. | Zona pellucida |
3. | Corona Radiata | 4. | Vitelline membrane |
Which set is similar:
1. Corpus luteum – Graafian follicles
2. Sebum-sweat
3. Bundle of his – Pacemaker
4. Vita - Niacin
After ovulation, follicles convert into:
1. Corpus luteum
2. Corpus albicans
3. Corpus cavernosa
4. Corpus callosum
Which of these induces the development of corpus Luteum:
1. LH
2. Oestrogen
3. FSH
4. LTH
Ovulation in the human female normally takes place during which phase of the menstrual cycle:
1. Just before the end of the secretory cycle.
2. At the beginning of the proliferative phase.
3. At the end of the proliferative phase.
4. At the mid-secretory phase.
About which day in a normal human menstrual cycle does rapid secretion of LH (popularly called LH-surge) normally occurs?
1. 11th day
2. 14th day
3. 20th day
4. 5th day
What happens during fertilisation in humans after many sperms reach close to the ovum?
1. | Only two sperms nearest the ovum penetrate zona pellucida |
2. | Secretions of acrosome help one sperm enter the cytoplasm of the ovum through zona pellucida |
3. | All sperms except the one nearest to the ovum lose their tails |
4. | Cells of corona radiata trap all the sperms except one |
Signals from fully developed foetus and placenta ultimately lead to parturition which requires the release of:
1. Oxytocin from maternal pituitary
2. Oxytocin from foetal pituitary
3. Relaxin from the placenta
4. Estrogen from placenta