Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Embryo-Fertilization

Med’11 Embryology Fertilization

QuestionAnswer
What is fertilization? It is the fusion between sperm and ovum to form a zygote.
What is the normal site of fertilization? In the laterla 1/3 of the Fallopian tube (the ampulla of the tube)
When can fertilization occur? Why? Within 24 hours from ovulation. The 2ry oocyte is viable for only 24 hours; by that time, it has just reached the lateral 1/3 of the Fallopian tube.
What are the steps of fertilization? 1.Transport of Gametes 2.Sperm conditioning
How is the ovum transported to the site of fertilization? In ovulation, fimbriated end of uterine tube becomes closely applied to ovary. Its fingerlike fimbria move back & forth over ovary & “sweep” 2ry oocyte into infundibulum of uterine tube. Oocyte then passes into ampulla of the tube by waves of peristalsis.
How is sperm transported to the site of fertilization? 200-300 million sperms are deposited in fornix of vagina. Most sperms degenerate;300-500 reach fert. site. Takes 2-7 hrs. Cervical mucus inc and is less viscid. Prostaglandins stimulate uterine motility, which help movement of sperm.
What characteristics or changes help the sperm reach the ovum? At time of ovulation cervical mucus inc&becomes less viscid Prostaglandins in semen stimulate uterine motility at time of intercourse&assist in movement of sperm through uterus&uterine tubes to site of fert. in ampulla Fructose in semen is energy source
What are the 2 changes of sperm conditioning? When must these changes occur? Changes: 1.Capacitation 2.Acrosome reaction Before fertilizing the ovum
How long does capacitation take? 5-7 hours
Where does capacitation occur? In uterus and uterine tubes
What happens during capacitation? Glycoprotein coat and seminal plasma proteins are removed from cell membrane covering acrosomal capsule.
NOTE *Sperm can’t fertilize oocyte when they are newly ejaculated. *Capacitated sperms are more active. *The acrosomal reaction can’t occur until capacitation has occurred.
Where does the acrosome reaction occur? In the vicinity of the oocyte
What happens in the acrosome reaction? It is under the influence of the substance produced by the corona radiata. Fusion occurs between the outer acrosomal membrane and the cell membrane of the corona radiata with the release of acrosomal enzyme.
What are the chemicals responsible for acrosome reaction? a)Hyaluronidase results in digestion of the corona radiata. b)Trypsin-like substance & zona lysin lead to penetration of the zona pellucida.
Created by: Salma O
Popular Medical sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards