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33 Cards in this Set
- Front
- Back
Which of the following statements about ectopic pregnancy is false? It does not yield a viable embryo Vaginal delivery is often possible It occurs in less than one percent of pregnancies The mother's life may be endagered The embryo may implant in the uterine tube |
Vaginal delivery is often possible. |
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In ________, implantation occurs somewhere other than in the uterus. |
ectopic pregnancy |
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How many chromosomes to human gametes contain? 12 92 23 46 6 |
23 |
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Stretching the cervix causes an increase in the blood levels of |
oxytocin |
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The blood vessels that carry deoxygenated blood to the placenta are the |
umbilical arteries |
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Progesterone calms the myometrium and prevents contraction. What factors antagonize progesterone and trigger labor and delivery? -distortion of the myometrium -rising estrogen levels increase sensitivity -rising oxytocin levels lead to uterine contractions -distortion of the cervix -All of the above. |
All of the above. |
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Oxygenated blood from the placenta returns to the fetus in the |
umbilical veins |
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Genes that appear on the X-chromosome are said to be |
X-linked |
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How many chromosomes do human somatic cells contain? |
46 |
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Which embryonic germ layer forms the linings of the respiratory and digestive tracts? |
endoderm |
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The developing fetus receives nutrient rich lood through the |
umbilical vein |
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Which embryonic germ layer forms the brain and spinal cord? |
ectoderm |
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Non-sex chromosomes are called |
autosomal |
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Which embryonic germ layer forms connective tissues such as bone and cartilage? |
mesoderm |
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The period of gestation when the rudiments of all major organ systems are established is the _______ trimester |
first |
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The gradual modification of anatomical structures and physiologic characteristics from fertilization to maturity is termed |
development |
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If a sperm carrying the Y chromosome fertilizes the ovum, the resulting offspring will be |
male |
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How many different chromosomes do human somatic cells contain? |
46 |
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The period of gestation when organs and organ systems complete most of their development and the fetus looks distinctly human is the ______ trimester |
second |
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A zygote whose genotype is XX will develop as a |
female |
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The full set of genetic information is an individual's chromosomes is called |
genome |
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Blood flows to the placenta through_____ umbilical artery(ies). 1 2 3 4 5 |
2 |
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How many chromosomes do human gametes contain? |
23 |
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The formation of different types of cells required in development, or _________, occurs through selective changes in genetic activity. |
differentiation |
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The special type of cell division required to produce gametes is called |
meiosis |
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How many tetrads form during synapsis? |
23 |
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The formation of a tetrad of maternal and paternal chromosomes during spermatogenesis is called |
synapsis |
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A primary spermatocyte matures into ___ spermatids having _____ chromosomes |
four, 23 |
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During meiosis I, maternal and paternal chromosomes come together during the process called _____ to form a _____. |
synapsis; tetrad |
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The special type of cell division required to produce gametes is called |
meiosis |
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When spermatogonia divide, the daughter cells are called |
spermatocytes |
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Crossing over occurs during ______ of meiosis ___. |
prophase; I |
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Sperm develop from stem cells called |
spermatogonia |