Identify the correct statement:
1. | GnRH stimulates the production of estrogen [in females] or testosterone [in males] directly |
2. | LH stimulates ovulation (female) or spermatogenesis (male) |
3. | FSH initiates and maintains the development of accessory sex organs (both sexes) |
4. | estrogen stimulates oogenesis (female only) |
Identify the cells that are haploid: (1) spermatogonia (2) primary spermatocytes (3) secondary spermatocytes (4) spermatids (5) spermatozoa
1. | 1, 2, and 3 | 2. | 2, 3, 4, and 5 |
2. | 3, 4, and 5 | 4. | 4 and 5 only |
After leaving the testes, spermatozoa pass sequentially through the :
1. | seminiferous tubule, rete testis, efferent ductule, and epididymis |
2. | epididymis, ductus deferens, seminal vesicle, and ejaculatory duct |
3. | membranous urethra, prostatic urethra, and spongy urethra |
4. | epididymis, ductus deferens, ejaculatory duct, and urethra |
The process of maturation of spermatids to sperms and the cells that facilitate this process are respectively:
1. spermiogenesis; sustentacular cells
2. spematocytogenesis; spermatogonia
3. spermiation; Sertoli cells
4. spermatogenesis; interstitial cells
Ectopic pregnancies are referred to as :
1. | pregnancies with a genetic abnormality |
2. | implantation of the embryo at a site other than the uterus |
3. | implantation of a defective embryo in the uterus |
4. | pregnancies terminated due to hormonal imbalance |
Which one of the following is not the function of the placenta?
1. | It facilitates the supply of oxygen and nutrients to the embryo |
2. | It secretes oestrogen |
3. | It facilitates the removal of carbon dioxide and waste material from the embryo |
4. | It secretes oxytocin during parturition |
In a normal pregnant woman, total gonadotropin activity was assessed. The expected result was :
1. | High level of circulating FSH and LH in the uterus to stimulate implantation of the embryo |
2. | High level of circulating HCG to stimulate endometrial thickening |
3. | High levels of FSH and LH in the uterus to stimulate endometrial thickening |
4. | High level of circulating HCG to stimulate oestrogen and progesterone synthesis |
Which one of the following statements about morula in humans is correct?
1. | It has an almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA |
2. | It has far less cytoplasm as well as less DNA than in an uncleaved zygote |
3. | It has a more or less equal quantity of cytoplasm and DNA as in an uncleaved zygote |
4. | It has more cytoplasm and more DNA than an uncleaved zygote |
Which one of the following is the most likely reason for the regular menstruation cycle not occurring in females?
1. | Fertilisation of the ovum |
2. | Maintenance of the hypertrophical endometrial lining |
3. | Maintenance of a high concentration of sex hormones in the bloodstream |
4. | Retention of well-developed corpus luteum |
Column I | Column II | |
1. | Ovulation | LH and FSH attain peak levels and sharp fall in the secretion of progesterone |
2. | Proliferative phase | Rapid regeneration of myometrium and maturation of Graafian follicle |
3. | Development of corpus luteum | Secretory phase and increased secretion of progesterone |
4. | Menstruation | Breakdown of myometrium and ovum not fertilized |