Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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When is amniocentesis performed?
Expert Solution
Step 1: Introduction
Fertilization is key process in sexual reproduction. When male and female gamete unites successfully and form a diploid zygote – the process is called as fertilization.
Once fertilization takes place, embryo development begins after 4 days in humans.
Embryonic stage lasts till 8 weeks from time of implantation in uterus. In these 8 weeks- various structures are formed at particular time.
After 8 weeks – embryo is much developed and its called as foetus.
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