Human Reproduction Test - 10

Testosterone hormone help in release of sperm from testis. This hormone is released by leydig cells present in between seminiferous tubules of testis.

In human female menstrual cycle is repeated at the interval of 28/29 days from menarche to menopause. Menstrual cycle gets stopped during pregnancy.

Millions of sperms are released during insemination that reaches to ovum for fertilisation. Only one sperm enter the ovum by penetrating the zona pellucida layer of ovum using the enzyme present in its acrosome.

The stoppage of menstrual cycle in human female is called menopause. This indicates the end of reproductive phase of female at the age of about 50 years.

Menstrual cycles get stopped during pregnancy. Sometimes it becomes irregular due to stress and other hormonal activities of the body.

The inner cell mass (embryo) contains certain cells called stem cells that have capability to give rise to all tissues or organ in adult.

Menstrual cycle is divided into several phase starting from menses during which endometrium breaks and comes out through vagina for 4 to 5 days. Ovulatory phase occurs in the middle of menstrual cycle (14/15th day) during which egg is released.

Mammalian sperm acrosome contains enzyme hyaluronidase that break down the Zona pellucida layer of ovum for fertilisation. Acrosome is present at the tips of sperm.

After the entry of sperm into the egg the zona pellucida layer undergoes physical changes that prevent the entry of addition sperm. This reaction between zona pellucida is called cortical reaction.

Transfer of male gamete into female genital tract takes place during sexual intercourse, which is also called as coitus. Clitoris is the part of female reproductive system, colostrum is first milk secreted from mammary gland.