40. During the period of prenatal development, the placenta must achieve implant

Question

40. During the period of prenatal development, the placenta must achieve implantation. A) germinal B) embryonic C) fetal D) conception 47. Which of the following structures develops first during the period of the embryo? A) B) C) D) the neural tube the primitive streak the upper arms the placenta 48. During the embryonic period, the neural tube will become the A) B) C) D) reproductive organs intestinal tract backbone, legs, and arms central nervous system, brain, and spinal cord 49. The head appears in the week after conception. A) fourth B) fifth C) sixth D) seventh

Explanation / Answer

40. (D)

During the conception stage, fertilized egg stays in the fallopian tube for about three to four days. But within 24 hours of being fertilized, it starts dividing fast into many cells. It keeps dividing as it moves slowly through the fallopian tube to the uterus and finally attaches itself to the lining of the uterus.

47.(B)

48.(D)

49.(D)

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