Explain the terms: a. Implantation b. Placenta c. What is the average duration of human
Answers
Explanation:
(a) Implantation: The embryo enters the uterus at the stage of the blastocyst and becomes attached to the wall of the uterus, where it is to perform its subsequent development. This attachment of the blastocyst to the uterine wall is known as implantation.
(b) Placenta: It is a temporary organ built up of maternal and foetal tissues jointly. It serves for the transport of nutrients from the tissues of the mother with those of the embryo as well as the exchange of gases between the tissues of the two.
A. In humans, implantation is the stage of human reproduction at which the embryo adheres to the wall of the uterus. At this stage of prenatal development, the conceptus is called a blastocys.
B. The placenta is an organ that develops in your uterus during pregnancy. This structure provides oxygen and nutrients to your growing baby and removes waste products from your baby's blood. The placenta attaches to the wall of your uterus, and your baby's umbilical cord arises from it.
C. Length of gestation
Length of gestation The average length of human gestation is 280 days, or 40 weeks, from the first day of the woman's last menstrual period. The medical term for the due date is estimated date of confinement (EDC). However, only about four per cent of women actually give birth on their EDC.
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