Which of the following increases the levels of Sex Hormone Binding Globulin (SHBG) in the plasma?
Anonymous Quiz
10%
Growth hormone
48%
Estrogen
8%
Testosterone
35%
A , C only
What is/are the physiologic affect/s of Testosterone?
Anonymous Quiz
3%
Acceleration of epiphysial closure
3%
Penile & scrotal growth
0%
Growth of body hair
95%
All of the above
Which of the following is TRUE regarding regulation of testicular function?
Anonymous Quiz
3%
Low levels of testosterone suppresa anterior pituitary gonadotropins.
3%
Activin causes feedback suppression of both the pituitary and hypothalamus.
20%
FSH stimulates tastosterone synthesis by the Leydig culls.
74%
The hypothalamus-pituitary-testicular axis is sensitive during puberty.
What is the effect of Testosterone when given to the females?
Anonymous Quiz
0%
Clitoral enlargement
3%
Hirsutism
3%
Front baldness
95%
All of the above
The normal seminal ejaculate
Anonymous Quiz
0%
Has a volume of about 5-10 ml.
6%
Comes mainly from the seminiferous tubules and epididymis.
92%
Contains fructose from the seminal vesicles
3%
Its PH is acidic.
Removal of the testes in the adult causes
Anonymous Quiz
6%
A rise in the pitch of the voice
89%
Loss of libido, Hot flushes, irritability and depression
3%
Loss of the ability to copulate
3%
A fall in the blood levels of LH and FSH.
Secondary sexual characteristics do not develop in children
Anonymous Quiz
16%
Whose seminiferous tubules, but not interstitial cells, have been damaged by radiation.
13%
Suffering from severe malnutrition
6%
With undescended testis
66%
Lacking pituitary hormones.
Infertility in the male can be explained by observations that
Anonymous Quiz
61%
There are no motile sperms in seman 15 minutes after ejaculation.
15%
20% of the sperma in the semen are abnormal
18%
The sperm count is 10"/ml
6%
The sperm count is more than 50 milions/ml.
If a young woman has high plasma levels of T3, cortisol, and renin activity but her blood pressure is only slightly elevated and she has no symptoms or signs of thyrotoxicosis or Cushing syndrome, the most likely explanation is that:
Anonymous Quiz
13%
She has been treated with TSH and ACTH
0%
She has been treated with 13 and cortisick
80%
She is in the third trimester of pregnancy.
7%
She has an adrenocortical tumor
In humans, fertilization usually occurs in the
Anonymous Quiz
3%
Vagina.
0%
Cervix
3%
Uterine cavity,
94%
Uterine tubes.
Which of the following is not a steroid?
Anonymous Quiz
6%
17a-hydroxyprogesterone
0%
Estrone
85%
Relaxin
9%
Pragnenolone
Which of the following probably triggers the onset of labor?
Anonymous Quiz
16%
ACTH in the fetus
3%
ACTH in the mother
0%
Prostaglandins
81%
Oxytocin
Loss of libido can be due to?
Anonymous Quiz
72%
Low testosterone level,
0%
Use of antibiotics
0%
Occasional drinking of alcohol
28%
All of the above
Which of the following inhibits pituitary FSH secretion?
Anonymous Quiz
0%
Testosterone
0%
LH
100%
Inhibin
0%
GnRH
When does maturation of graafian follicle begin?
Anonymous Quiz
3%
Before birth
3%
After menopause
91%
At puberty
3%
During childhood
Which of the following hormones stimulates the growth of small ovarian follicles at the beginning of the follicular phase of menstrual cycle?
Anonymous Quiz
3%
LH
0%
ACTH
0%
TSH
97%
FSH
Which of the following describes triggering of LH surge (sudden Increase) by rising level of estrogen at the time of ovulation?
Anonymous Quiz
97%
Positive feedback
0%
Short loop negative
0%
Long loop negative feedback
3%
Ultrashort negative feedback
Which of the following hormones inhibits FSH by negative feedback in the follicular phase of menstrual cycle?
Anonymous Quiz
9%
LH
3%
HCG
12%
Progesterone
76%
Estrogen
On which of the following menstrual cycle days does ovulation occur in a typical 28-day cycle?
Anonymous Quiz
0%
Day 5
0%
Day 21
3%
Day 35
97%
Day 14
Which of the following hormones causes growth and rupture of mature graafian follicle to release the ovum at the time of ovulation?
Anonymous Quiz
18%
FSH
15%
Estrogen
9%
Progesterone
59%
LH