Each seminiferous tubule is lined by male germ cells called:
1. | Spermatogonia | 2. | Primary spermatocytes |
3. | Sertoli cells | 4. | Leydig cells |
FSH:
1. | Acts on Sertoli cells and stimulates secretion of some factors that help in spermiogenesis |
2. | Acts on Sertoli cells and inhibits secretion of some factors that help in spermiogenesis |
3. | Acts on Leydig cells and stimulates secretion of some factors that help in spermiogenesis |
4. | Acts on Leydig cells and inhibits secretion of some factors that help in spermiogenesis |
The testes are situated outside the abdominal cavity within a pouch called the scrotum. This is necessary as:
1. | The scrotum can contain lengthy ducts for the transfer of sperms |
2. | Scrotum helps in maintaining the low temperature of the testes necessary for spermatogenesis |
3. | Scrotum reduces the pressure around the testes necessary for spermatogenesis |
4. | Scrotum can store huge amounts of sperms |
The final release of sperms from the seminiferous tubules is called:
1. | Spermiation | 2. | Emission |
3. | Retrograde ejaculation | 4. | Ejaculation |
Which of the following helps spermatids in their transformation to sperms?
1. | Leydig cells | 2. | Type B spermatogonia |
3. | Type A spermatogonia | 4. | Sertoli cells |
The birth canal is formed by:
1. Vagina alone
2. Vagina and the cervix
3. Vagina, cervix and uterus
4. Vagina, cervix, uterus and oviducts
Seminal plasma is rich in:
1. Sucrose, calcium and certain enzymes
2. Glucose, sodium and certain enzymes
3. Fructose, calcium and certain enzymes
4. Fructose, sodium and certain enzymes
Leydig cells:
1. | Are present in seminiferous tubules and secrete androgens |
2. | Are present in seminiferous tubules and help in the maturation of sperms |
3. | Are present in interstitial space and secrete androgens |
4. | Are present in interstitial space and help in the maturation of sperms |
The division of primary oocyte results in:
1. | unequal cells – a smaller haploid secondary oocyte and a larger diploid polar body |
2. | unequal cells – a larger haploid secondary oocyte and a smaller haploid polar body |
3. | unequal cells – a smaller diploid secondary oocyte and a larger haploid polar body |
4. | equal cells – a haploid secondary oocyte and a haploid polar body |
Leydig cells synthesize androgens under the direct influence of:
1. | FSH | 2. | LH |
3. | FSH and LH | 4. | GnRH |