The umbilical cord of a human fetus normally contains
Correct answer: B. two arteries and one vein
- A. one artery and one vein
- B. two arteries and one vein
- C. two arteries and two veins
- D. one artery and two veins
Explanation
Two umbilical arteries carry deoxygenated blood and wastes from fetus to placenta, while the single umbilical vein returns oxygenated blood and nutrients. Veins here carry waste and arteries carry it away, the reverse of the adult pattern, which catches many students.
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About Human Reproductive System
The human reproductive system includes the male and female organs that produce gametes, secrete sex hormones and support fertilization and development. Questions cover the testes, ovaries, reproductive ducts, menstrual and ovarian cycles, ovulation, fertilization, implantation, placenta formation and the roles of FSH, LH, oestrogen, progesterone and testosterone.
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