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Questions and Answers
Before orgasm: small amount, ______ gland secretions
Before orgasm: small amount, ______ gland secretions
bulbourethral
During orgasm: majority release, ______ vesicle/prostate secretions
During orgasm: majority release, ______ vesicle/prostate secretions
seminal
A single ejaculation has an average of 182 million ______
A single ejaculation has an average of 182 million ______
sperm
The acrosome contains many enzymes vital for ______
The acrosome contains many enzymes vital for ______
Two ova and two sperm = ______
Two ova and two sperm = ______
One ova and one sperm spontaneously splitting = ______
One ova and one sperm spontaneously splitting = ______
______ is the development of a new zygote without a fertilization event. This is a new organism forming from an egg not penetrated by sperm.
______ is the development of a new zygote without a fertilization event. This is a new organism forming from an egg not penetrated by sperm.
______ Occurs from errors in meiosis or fertilization. Most (>90%) will spontaneously abort within the first trimester.
______ Occurs from errors in meiosis or fertilization. Most (>90%) will spontaneously abort within the first trimester.
Seminal ______ upon entry into the vaginal canal, but liquefies again after 20 minutes, increasing vaginal pH to 7.2
Seminal ______ upon entry into the vaginal canal, but liquefies again after 20 minutes, increasing vaginal pH to 7.2
Orgasm induces rhythmic contractions in the ______ which move sperm towards the cervix and uterus
Orgasm induces rhythmic contractions in the ______ which move sperm towards the cervix and uterus
Cervical mucus liquefies around ovulation allowing sperm to pass into the uterus, but only about 1 million sperm make it through the ______
Cervical mucus liquefies around ovulation allowing sperm to pass into the uterus, but only about 1 million sperm make it through the ______
Sperm 'climb' up the uterus aided by uterine contractions and cilia action, but many are targeted by ______
Sperm 'climb' up the uterus aided by uterine contractions and cilia action, but many are targeted by ______
The ______ acts as a temporary storage area for sperm, with many swimming past the ovulated egg
The ______ acts as a temporary storage area for sperm, with many swimming past the ovulated egg
Capacitation and hyperactivation of sperm are necessary for fertilization, enabling them to survive in the reproductive tract for up to 6 ______
Capacitation and hyperactivation of sperm are necessary for fertilization, enabling them to survive in the reproductive tract for up to 6 ______
Fertilization is most likely to occur in the 5 days before ovulation and the day of ______
Fertilization is most likely to occur in the 5 days before ovulation and the day of ______
Steps of fertilization involve penetration of the cumulus oophorus, zona pellucida, attachment to the egg plasma membrane, cortical reaction, completion of meiosis II, and ______ generation
Steps of fertilization involve penetration of the cumulus oophorus, zona pellucida, attachment to the egg plasma membrane, cortical reaction, completion of meiosis II, and ______ generation
Hyaluronidase in sperm breaks down hyaluronic acid in the cumulus oophorus, allowing sperm to reach the ______
Hyaluronidase in sperm breaks down hyaluronic acid in the cumulus oophorus, allowing sperm to reach the ______
Sperm recognition of a glycoprotein in the zona pellucida triggers the acrosome reaction, leading to the degradation of the ______
Sperm recognition of a glycoprotein in the zona pellucida triggers the acrosome reaction, leading to the degradation of the ______
Completion of meiosis II in the egg after fertilization removes extra DNA copies and creates the second ______
Completion of meiosis II in the egg after fertilization removes extra DNA copies and creates the second ______
The egg and sperm pronuclei migrate towards each other, replicate their DNA, and fuse to create the zygote. The primary sex ratio is 120:100 for early aborted embryos and 105:100 for ______
The egg and sperm pronuclei migrate towards each other, replicate their DNA, and fuse to create the zygote. The primary sex ratio is 120:100 for early aborted embryos and 105:100 for ______
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Study Notes
Human Reproductive Biology: Fertilization and Sperm Transport
- Semen thickens upon entry into the vaginal canal, but liquefies again after 20 minutes, increasing vaginal pH to 7.2.
- Orgasm induces rhythmic contractions in the vagina which move sperm towards the cervix and uterus.
- Cervical mucus liquefies around ovulation allowing sperm to pass into the uterus, but only about 1 million sperm make it through the cervix.
- Sperm "climb" up the uterus aided by uterine contractions and cilia action, but many are targeted by macrophages.
- The oviduct acts as a temporary storage area for sperm, with many swimming past the ovulated egg.
- Capacitation and hyperactivation of sperm are necessary for fertilization, enabling them to survive in the reproductive tract for up to 6 days.
- Fertilization is most likely to occur in the 5 days before ovulation and the day of ovulation.
- Steps of fertilization involve penetration of the cumulus oophorus, zona pellucida, attachment to the egg plasma membrane, cortical reaction, completion of meiosis II, and pronuclei generation.
- Hyaluronidase in sperm breaks down hyaluronic acid in the cumulus oophorus, allowing sperm to reach the zona pellucida.
- Sperm recognition of a glycoprotein in the zona pellucida triggers the acrosome reaction, leading to the degradation of the zona pellucida.
- Completion of meiosis II in the egg after fertilization removes extra DNA copies and creates the second polar body.
- The egg and sperm pronuclei migrate towards each other, replicate their DNA, and fuse to create the zygote. The primary sex ratio is 120:100 for early aborted embryos and 105:100 for births.
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