There are three stages of prenatal development:
germinal, embryonic, and fetal
.
What are the 3 major stages of prenatal development?
The process of prenatal development occurs in three main stages. The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as
the fetal period
.
What is the correct order of prenatal development?
There are three stages of prenatal development:
germinal, embryonic, and fetal
.
In what order do the stages of prenatal development occur quizlet?
Prenatal development proceeds through the germinal (first 2 weeks),
embryonic (2 weeks to 2 months)
, and fetal stages (2 months to birth) as the zygote is differentiated into a human organism.
What are the stages of pregnancy development?
It is divided into three stages, called trimesters:
first trimester, second trimester, and third trimester
. The fetus undergoes many changes throughout maturation.
What is the correct order of development?
(A) Correct sequence in development is
Fertilization → Zygote → Cleavage → Morula → Blastula → Gastrula.
Which is the longest stage of prenatal development?
In
the fetal stage
, the developing human organism is called a fetus. This is the longest stage, starting in the ninth week after conception and continuing until birth.
What stage of prenatal development does breathing begin?
*Around 18 weeks, fetal movement can be felt. *Around 19 weeks, the fetus can hear. *
Around 27 weeks
, breathing movements begin in preparation for breathing outside the womb.
What are the factors that affect prenatal development?
Prenatal risk factors include
chronic maternal illness, certain maternal infections, toxin exposures and nutritional deficiencies
. Risk factors in the perinatal period include pregnancy-related complications, prematurity and low birth weight, and infection exposure during pregnancy or at time of birth.
What are 4 environmental factors that can harm a fetus?
Environmental factors which have been implicated in adverse pregnancy outcome include
smoking, video display terminals, anesthetic gases, antineoplastic drugs and exposure to lead, selenium and inorganic mercury
.
What is the shortest stage of prenatal development?
The germinal stage of development
is the first and shortest of the stages of the human lifespan.
At what stage does the umbilical cord develop?
The umbilical cord is the vital connection between the fetus and the placenta. Umbilical cord development begins in the
embryologic period around week 3
with the formation of the connecting stalk.
What are the 3 stages of prenatal development quizlet?
This period is generally divided into three stages:
the germinal stage, the embryonic stage, and the fetal stage
.
What is the first stage of pregnancy?
For a lot of people, the first sign of pregnancy is
a missed period
. Most pregnancy tests will be positive by the time you’ve missed your period. Other early pregnancy symptoms include feeling tired, feeling bloated, peeing more than usual, mood swings, nausea, and tender or swollen breasts.
What is the first stage of pregnancy called?
The first third of your pregnancy is called the
first trimester
. It’s made up of weeks 1 through 12 or 13 of pregnancy.
How does day 1 of pregnancy work?
Your
weeks of pregnancy are dated from the first day of your last period
. This means that in the first 2 weeks or so, you aren’t actually pregnant – your body is preparing for ovulation (releasing an egg from one of your ovaries) as usual.
