Match the correct time period of gestation with the prenatal period of development:
_____________ Pre-embryonic period
______________Fetal period
______________Embryonic period
a. Weeks 3–8
b. Weeks 1–2
c. Weeks 9–38
To review:
Match the correct period of gestation with the prenatal period of development:
______ Pre-embryonic period
______ Fetal period
______ Embryonic period
a. Weeks 3-8
b. Weeks 1-2
c. Weeks 9-38
Introduction:
Pregnancy includesall the processes that lead to conception, where an oocyte is developed, until the birth of thechild. The oocyte is developed during the gestation period, which lasts from the menstrual period until the birth of a child, which is for a time period of 40 weeks. This gestation period is longer than theprenatal period.
Explanation of Solution
The pre-embryonic period lasts for the first two weeks after fertilization, when the secondary oocyte is fertilized by the aid of the sperm cell and the secondary oocyte undergoes the process of meiosis II in order to turn into an ovum. The female and the male nuclei come together to give rise to a zygote. Hence, weeks 1-2 is the correct time period for the pre-embryonic period.
During the fetal period, the gestation process occurs from week 9 to week 38, till birth. In this, the conceptus is known as thefetus, which grows larger to develop the organ systems that function without the aid from the mother later. Thus, weeks 9-38 consist of the fetal period.
The embryonic period lasts the third week to the eighthweek of gestation. Thus, weeks 3-8 consist of the embryonic period. During this phase, the conceptus grows rapidly, and forms and folds into the rudimentary organ systems.
Term | Period |
Pre-embryonic period | (b)Weeks 1-2 |
Embryonic period | (a)Weeks 3-8 |
Fetal period | (c)Weeks 9-38 |
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Chapter 27 Solutions
HUMAN ANAT&PHYS&MOD MA&P/ET&PHOTO ATLAS
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