Shared Flashcard Set

Details

Preconception and Conception
Fetal Development
19
Nursing
Undergraduate 4
08/19/2010

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Cards

Term
What is Mitosis?
Definition

Mitosis is the process of cell division that results in daughter cells that are the exact copy of the original cell.

 

It makes growth and development possible. Mitosis contains a full set of chromosomes called diploid.

Term
What is meiosis?
Definition

Process of cell divison that leads to the development of eggs and sperm.

Contains only half the number of chromosomes called 'haploid'

Term
How long does a menstrual cycle average?
Definition
28 days
Term
During the first 2 weeks of your menstrual cycle what builds?
Definition
The endometrium builds. It is a blood rich tissue on the inside of the uterus.
Term
When is a mature egg released?
Definition
Usually on day 14. This is called ovulation.
Term
How long is a egg fertile?
Definition
A egg is fertile 3 days before and 3 days after ovulation.
Term
How long can sperm survive after it is deposited inside the female?
Definition
3-5 days
Term
When does fertilization occur? What is formed after fertilization?
Definition

When the sperm penetrates the ovum (mature egg)

 

A zygote is formed.

Term
Where does fertilization usually occur?
Definition
In the outer 1/3 of the fallopian tube.
Term
How long does the zygote travel down the fallopian tube to the uterus?
Definition
3-4 days
Term
What is the amion?
Definition
The amion is the fluid filled sac that holds the embryo.
Term
What is the function of the chorion?
Definition
It envelopes the other structures within the uterus.
Term
Name three functions of the placenta?
Definition

1. Secrete hormone to sustain pregnancy.

2. Serves metabolic, endocrine and immune functions

3. Excretes and gives nutrients to the fetus.

Term
How many vessels are in the umbilical cord? What are they and how do they function?
Definition
There are 2 arteries and 1 vein. The vein carries blood too the fetus from the placenta and the arteries carries blood away from the fetus.
Term
How long does the preembryonic stage last?
Definition
It lasts from conception to 14 days (2 weeks)
Term
How long does the embryonic stage last?
Definition
From day 15 to 8 weeks
Term
What change happened during the embryos 4 week?
Definition
The heart begins to beat after the first month.
Term
What change occurs in the 6 week of an embryos life?
Definition
Circulation is established.
Term
How long does the fetal stage last?
Definition
8 weeks until birth
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