During which of these time periods do teratogens have the most serious effects on fetal development?
A) period of fertilization
B) first six months of pregnancy
C) period of organogenesis
D) final three months of pregnancy
Answer: C) period of organogenesis
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A shiny, vascular lining of loose connective tissue that forms the inner layer of
the joint capsule is the _______ membrane. Fill in the blank(s) with correct word
A major difference between fetal blood flow and adult blood flow is that in the fetus the
A) inferior vena cava contains blood high in oxygen. B) internal iliac arteries are known as umbilical arteries. C) femoral vein contains blood low in oxygen. D) pulmonary artery delivers blood to the lungs.
The ions in highest concentration in the extracellular fluid are sodium and
A) chloride. B) potassium. C) calcium. D) magnesium. E) phosphorus.
Neither follicle stimulating (FSH) hormone nor testosterone alone can stimulate significant sperm production, whereas when they act together, the testes produce some 300,000 sperm per minute. This is an example of which principle regarding hormones?
A. Hormone clearance B. The antagonistic effect C. The permissive effect D. The synergistic effect E. The cascade effect