Human Reproduction Test 5

As male attain puberty. Leydig cells surrounding seminiferous tubules start to secrete testosterone hormone which initiate Spermatogenesis in Seminiferous tubules.

Interstitial cell secrete Testosterone as main Androgen.

Primary sex organs(ovaries and testes) have the ability to produce sperms and eggs (gametes) and harmones like testosterone (males) , estrogen and progesterone (females) while secondary sex organs can help in conduction of the gametes and contribute to the media transporting them(eg. seminal plasma) but do not produce harmones.

A is the correct answer 

A primary spermatocyte completes the first meiotic division (reduction division) leading to formation of two equal, haploid cells called secondary spermatocytes, which have only 23 chromosomes each.

Secondary oocyte: The secondary oocyte is the cell that is formed by meiosis I in oogenesis. Thus, it has only one of each pair of homologous chromosomes

Both Ovum and Sperm have haploid content 

Spermatogenesis get completed in seminiferous tubule.

Sertoli cells provide nutrition to the germ cells.

Human sperm is haploid cell have flagellated tail like structure for movement.

The middle piece possesses numerous mitochondria, which produce energy for the movement of tail that facilitates sperm motility essential for fertilisation.

Sperm head have acrosome which produce Hyaluronidase for digestion of corona radiata

Acrosome derived from Golgi body and have enzyme for sperm penetration

When the sperm enters egg, the flagella and the outer layer get disintegrated. This leads to cortical reaction which prevents other sperms from getting fused with egg. When the sperm gets entered zygote is formed by traveling of egg to the fallopian tube.

The after the zygote is formed it develops in a stage-wise manner to form a baby which takes 10 months for the fetus to develop and come out of the womb.

After spermiogenesis, sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation.

The liberation of sperms from testes is called Semination. The liberation of sperms from the body of the male is called Ejaculation. Mammalian sperms are transferred to the vagina of females by the process called insemination.

 

During multiplication phase, the germ cells of seminiferous tubules present near the capsule divide and produce primary spermatocytes cells by mitosis. The growth phase is marked by an increase in cell size of primary spermatocytes to undergo meiosis. The maturation phase starts with meiosis I in the primary spermatocyte to produces two secondary spermatocytes (n) which is followed by meiosis II that produces four spermatids. The maturation phase is the longest one. 

Acrosome derived from Golgi body and have enzyme for sperm penetration.

The middle piece possesses numerous mitochondria, which produce energy for the movement of tail that facilitates sperm motility essential for fertilisation.

Meiosis II is Equational division 

The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis.

Sertoli cells provide nutrition to the germ cells and can have negative feedback on GnRH.

Some of the spermatogonia called primary spermatocytes periodically undergo meiosis. A primary spermatocyte completes the first meiotic division (reduction division) leading to formation of two equal, haploid cells called secondary spermatocytes, which have only 23 chromosomes each. The secondary spermatocytes undergo the second meiotic division to produce four equal, haploid
spermatids 
 

LH acts at the Leydig cells and stimulates synthesis and secretion of androgens. Androgens, in turn, stimulate the process of spermatogenesis. FSH acts on the Sertoli cells

The middle piece possesses numerous mitochondria.

some Maturation of sperm occurs in Epididymis

After spermiogenesis,sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation.