Multiple Choice
The Apgar scale is used at one minute and five minutes after birth to _____.
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28. Human Development
Introduction to Human Development
Multiple Choice
Which of the following occurs if implantation is successful during early human development?
A
Fertilization occurs in the uterus
B
The embryo begins to secrete human chorionic gonadotropin (hCG)
C
Ovulation is triggered again
D
The endometrial lining is shed
Verified step by step guidance1
Understand the process of implantation: Implantation occurs when a fertilized egg (zygote) travels to the uterus and embeds itself into the endometrial lining, which is prepared to support early development.
Recall the role of human chorionic gonadotropin (hCG): hCG is a hormone secreted by the developing embryo after successful implantation. It signals the corpus luteum to continue producing progesterone, which maintains the endometrial lining and prevents its shedding.
Eliminate incorrect options: Fertilization does not occur in the uterus; it happens in the fallopian tube. Ovulation is not triggered again during pregnancy, as hormonal changes prevent further ovulation. The endometrial lining is not shed; instead, it is maintained to support the embryo.
Focus on the correct answer: The secretion of hCG is a key event following successful implantation, ensuring the pregnancy is sustained by maintaining the uterine environment.
Summarize the physiological importance: hCG secretion is critical for early pregnancy, as it prevents the menstrual cycle from resuming and supports the embryo's development by maintaining the uterine lining.
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