In vertebrate eggs with large yolks, cleavage is described as _______ and results in a ________ on top of the yolk.
1. meroblastic/trophoblast
2. holoblastic/blastodisc
3. meroblastic/blastodisc
4. meroblastic/blastomere
Cells forming the outer layer of a blastocyst, which provide nutrients to the embryo and develop into a large part of the placenta are:
1. trophoblast
2. inner cell mass
3. interstitial cells
4. balstomeres
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Till approximately what gestation age is the use of the term ‘embryo’ justified?
1. week
2. two weeks
3. month
4. two months
The cleavage divisions begin in:
1. ovary
2. oviduct
3. uterus
4. cervix
Epithelial linings of the digestive tract is derived from the embryonic:
1. ectoderm
2. mesoderm
3. endoderm
4. allantois
Within the fetus, much of the circulating blood bypasses the lungs and flows through the ______________.
1. ductus venosus
2. umbilical vein
3. umbilical artery
4. ductus arteriosus
Implantation does not:
1. involve a blastocyst
2. occur in the uterine tube
3. establishes pregnancy
4. occurs by seventh-eighth day
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The onset of puberty in males and females is due to the release of:
1. | LH |
2. | FSH |
3. | GnRH |
4. | hCG |
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Human chorionic gonadotropin (hCG):
1. stimulates the anterior pituitary to secrete gonadotropins
2. directly maintains the endometrium
3. triggers continued production of progesterone by the corpus luteum
4. stimulates development of the mammary glands
In males, parasympathetic and sympathetic stimulation lead respectively to:
1. sterility; impoetnce
2. impotence; sterility
3. erection; ejaculation
4. ejaculation; erection