Capacitation refers to changes in the:
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 |
Which one of the following is the most likely root cause of why menstruation is not taking place in regularly cycling human female?
1. | Fertilization of the ovum |
2. | Maintenance of the hypertrophical endometrial lining |
3. | Maintenance of high concentration of sex-hormones in the blood stream |
4. | Retention of well-developed corpus luteum |