100ft view pregnancy Flashcards
What layer of the endometrium in involved with implantation
stromal cells
How many sperm are released in male ejaculation
500 million
What is included in ejaculation
Prostaglandins
*causes uterine contraction to propel them upward
What is the pH of sperm
7.5
Where is sperm formed
vas defrens
Where does the fluid of the semen come from
seminal vesicles and prostate
How long do sperm live
24-48 hours (at body temperature)
What does the heavy cholesterol coating around the head of the sperm help with
Allows for influx of ca2+ so the flagellum are more motile
What is the coronal radiata
Remaining follicular cells after the release of the ovum from Graafian follicle
*contained carbs for ovum as well as hylauronic acid
What is capacitation
The outer layer of the sperm head is broken down so it can get through the ovum wall
What is the zona pellucid
layer of glycoprotein that prevent multiple sperm from binding
*initiates sperm captation
Where does fertilization generally occur
in the ampuls of the fallopian tube
What is released from the acrosome
hyaluronidase
proteolytic enzymes
What happens once a sperm has entered the ovum
The cell depolarizes so no other sperm are able to enter
What is the deciding gene for sex
SRY on the Y chromosome
*+= male
What is contained within a blastocyst
wall and embryonic pole
What does the pole in the blastocyst become
the embryo
How many days after fertilization does the blastocyst implant
6 days
What occurs to the corpus luteum when an ovum is fertilized
The placenta keeps it active for the first trimester instead of allowing it to degrade
When in a normal cycle does implantation occur
16-22 days