Conception PPT Flashcards
The meiotic process by which male gametes are produced
Spermatogenesis
The process by which female gametes are produced
Oogenesis
What is the smallest cell in the body?
Sperm
When does production of sperm begin?
At puberty in response to testosterone
What is an important factor in production of adequate numbers of sperm?
Temperature
How are sperm transported?
In secretions from the seminal vesicles and the prostate gland (seminal fluid)
What is the pH of seminal fluid? Why?
Alkaline–helps neutralize the normally acidic female vagina in an attempt to assure viability of the sperm until it can fertilize an ovum
What is the lifespan of sperm after ejaculation?
48-72 hours
How much sperm is in a normal ejaculation?
200-500 million
How is sperm transported..like what characteristic of it?
It has a flagellated, whip like motion
Can low sperm lead to infertility?
Yes
What is the average travel time from sperm to egg?
4-6 hours, but can reach in as little as 5 minutes
When do oocytes form?
12 weeks gestation
Is sperm cyclic?
No
Is ova follicle cyclic?
Yes, ovarian cycle
How many mature eggs does a female have in lifetime?
400-500
When does ovulation occur?
14 days (+/- 2) before the next menstrual period
What is hyaluronidase?
Path through cells for sperm to reach ovum
Removes the protective coating from the heads of the sperm
Capictation
Who determines sex of baby: male or female?
Male
23 pairs from each parent
22 are autosomes, leaving 2 chromosomes (or 1 pair) to determine the sex. Female can only give an X, so if dad gives an X sex is female, if dad gives a Y, sex in male
What secretes HCG to make sure the corpus luteum remains viable?
Blastocyst
How long does corpus leuteum secrete estrogen and progesterone?
First 2-3 months of pregnancy
When does mitotic cellular replication (cleavage) occur?
As baby (zygote) is propelled toward uterus
How many cells does morula have?
16
What is the out layer of cells in zygote?
Trophoblast
What is inner layer of cells in zygote?
Blastocyst (baby)
When is blastocyst implanted?
6-8 days after ovulation
Where is the site of implantation?
Upper portion of the uterus
What develops the chronic villi?
Trophoblast (outer layer)
What is chorionic villi?
Projections that extend into endometrium and tap into maternal blood supply for O2 and nutrients
After implantation the endometrium will now be referred to as _____
Decidua
Where is the decade basalis?
Beneath the blastocyst
Is IUD an inhibitor of implantation?
Yes, interferes with both fertilization and implantation
An IUD is medicated with copper or progesterone. What does progesterone do in this case?
Changes cervical mucus and endometrium to prevent fertilization
*IUD may cause substances to accumulate in the uterus and interfere with implantation; it can also scar the uterus and if it goes up too far it can implant into the cervical wall
Term for conception to day 14
Ovum
Time period for term embryo
Day 15-8 weeks