20- Fertilization & Implantation of the ova in the female represent the beginning step for the subsequent pregnancy; its character.
a- In humans, fertilization of the ovum by the sperm usually occurs in the ampulla of the uterine tube.
b- Fertilization involves chemo-attraction of the sperm to the ovum by substances produced by the sperm.
c-Millions of sperm are deposited in the vagina during intercourse; eventually, 5-10
sperm reach the ovum, and all may cause fertilization.
d- Testosterone hormone facilitates and required for the penetration of the sperm
through the zona pellucida.
e- When two sperm reach the membrane of the ovum, they will fuse to the ovum membrane, which ismediated by fertiline; a protein on the surface of the sperms
head
a- In humans, fertilization of the ovum by the sperm usually occurs in the ampulla of the uterine tube.
b- Fertilization involves chemo-attraction of the sperm to the ovum by substances produced by the sperm.
c-Millions of sperm are deposited in the vagina during intercourse; eventually, 5-10
sperm reach the ovum, and all may cause fertilization.
d- Testosterone hormone facilitates and required for the penetration of the sperm
through the zona pellucida.
e- When two sperm reach the membrane of the ovum, they will fuse to the ovum membrane, which ismediated by fertiline; a protein on the surface of the sperms
head
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26- Ovulation is caused by a sudden increase in the secretion of
Anonymous Quiz
23%
a- Estrogen
15%
b- Progesterone
55%
c- LH
5%
d- FSH
3%
e- Prolactin
31- All are true concerning an ovulatory cycle, except?
a- anovulatory cycles are common for the first 12-18 months after menarche and
again before the onset of the menopause.
b- no corpus luteum is formed
c- corpus luteum is formed
d- the effects of progesterone on the endometrium are absent.
e- Estrogens continue to cause growth
a- anovulatory cycles are common for the first 12-18 months after menarche and
again before the onset of the menopause.
b- no corpus luteum is formed
c- corpus luteum is formed
d- the effects of progesterone on the endometrium are absent.
e- Estrogens continue to cause growth
41- Before the average of 13years of age, the female child has no MC because
Anonymous Quiz
41%
a- The hypothalamus lacks appropriate stimulation from the limbic system
18%
b- The ovaries are less well developed
1%
c- The uterus is yet in the infantile size
4%
d- The vaginal epithelium is yet in the cuboidal form
35%
e-The anterior pituitary gland has low density of the gonadotropes
61- One of the following hormones is primarily induce the initiation of
labour:
labour:
Anonymous Quiz
63%
a- Oxytocin
12%
b- progesterone
10%
c- inhibin
9%
d- estrogen
6%
e- prolactin
82- What structure develops into a testis in genetic males during
embryonic development?
embryonic development?
Anonymous Quiz
8%
a- Cortex
85%
b- Medulla
4%
c- Müllerian duct
1%
d-Ovary
3%
e- Adrenal gland
109-During menstruation, what of the following contribute to the
menstrual flow?
menstrual flow?
Anonymous Quiz
23%
a- thickening of the endometrium
3%
b-growth of corpus luteum
12%
c- increase secretion of progesterone
9%
d- increase secretion of estrogen
53%
e-vasospasm and degeneration of spiral arteries
110-Which hormone is secreted in the urine of pregnant women?
Anonymous Quiz
14%
a- oxytocin
72%
b- beta-human chorionic gonadotropin
2%
c- somatotropin
3%
d- growth hormone
9%
e- prolactin
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‼️‼️تصحيح:
نقطة رقم 21 جوابه الصحيح C و ليس A
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‼️‼️تصحيح:
نقطة رقم 21 جوابه الصحيح C و ليس A
1. What is the function of Sertoli cells in the seminiferous tubules?
Anonymous Quiz
9%
a) Production of testosterone
30%
b) Formation of spermatozoa
44%
c) Maintenance of the blood-testis barrier
13%
d) Secretion of androgens
4%
e) Regulation of Leydig cell activity
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2. What is the purpose of the blood-testis barrier?
Anonymous Quiz
12%
a) To prevent the passage of androgens into the tubular lumen
16%
b) To allow the passage of large molecules from the basal compartment to the lumen
4%
c) To facilitate the movement of fluid out of the tubular lumen
67%
d) To protect germ cells from bloodborne noxious agents
1%
e) To maintain high levels of protein and glucose in the tubular lumen
3. What do the tight junctions between adjacent Sertoli cells near the basal lamina form?
Anonymous Quiz
87%
a) Blood-testis barrier
6%
b) Basal compartment
5%
c) Adluminal compartment
0%
d) Spermatic arteries
1%
e) Pampiniform plexus
4. What is the fluid in the lumen of the seminiferous tubules rich in?
Anonymous Quiz
18%
a) Protein and glucose
67%
b) Androgens and estrogens
5%
c) Sodium and chloride ions
6%
d) Nitric oxide
4%
e) Prostaglandins
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5. How do maturing germ cells pass through the blood-testis barrier?
Anonymous Quiz
18%
a) By disrupting the tight junctions
17%
b) By forming new tight junctions
15%
c) By penetrating the Sertoli cells
37%
d) By coordinated breakdown of the barrier
12%
e) By diffusion through the interstitial tissue
6. Which of the following cells mature into primary spermatocytes?
Anonymous Quiz
51%
a) Spermatogonia
25%
b) Secondary spermatocytes
10%
c) Spermatids
12%
d) Spermatozoa
2%
e) Sertoli cells
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7. How many chromosomes do spermatids contain?
Anonymous Quiz
35%
a) Diploid
51%
b) Haploid
3%
c) Triploid
8%
d) Tetraploid
4%
e) Aneuploid
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8. What organelle in the spermatozoon is involved in sperm penetration of the ovum?
Anonymous Quiz
4%
a) Mitochondria
4%
b) Golgi apparatus
5%
c) Endoplasmic reticulum
86%
d) Acrosome
0%
e) Nucleus