Results and stats for "Fertilisation"
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Most correctly guessed answers
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- The vagina has an [...] pH.
- acidic
- 100.0%
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- What characteristic of the vagina makes it hostile so sperm?
- Acidity
- 100.0%
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- [...]% of semen ejaculated into the vagina is retained around the cervix.
- 1
- 100.0%
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- What are some nutritional factors contained in semen?
- Fructose, sorbitol
- 100.0%
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- What is the purpose of the fructose and sorbitol found in semen?
- Nutritional factors for sperm
- 100.0%
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- What is the purpose of the reducing agents found in semen?
- Protect sperm from oxidation when exposed to atmospheric oxygen
- 100.0%
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- What are the hormones contained in semen which may stimulate muscular activity in the female tract?
- Prostaglandins
- 100.0%
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- What is the suggested purpose for the prostaglandins found in semen?
- Stimulate muscular activity in the female tract
- 100.0%
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- How does the consistency of semen change upon ejaculation?
- Coagulates
- 100.0%
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- How does sperm protect itself from the acidity of the vagina?
- Semen is alkaline
- 100.0%
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- [...] is present in high concentrations in semen and serves as food for sperm.
- Fructose
- 100.0%
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- Which hormones does semen contain?
- Prostaglandins (PGE and PGFα)
- 100.0%
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- When analysing semen, which 4 factors are investigated?
- Volume of ejaculate, sperm density, motility, and morphology
- 100.0%
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- In normal semen, ejaculate volume should be >[...] ml.
- 1.5
- 100.0%
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- In normal semen, spermatozoa motility should be >[...]% progressively motile.
- 40
- 100.0%
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- In normal semen, spermatozoa morphology should be >[...]% normal.
- 4
- 100.0%
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- At ovulation, is cervical mucus thin or thick?
- Thin
- 100.0%
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- Right after menstruation, is cervical mucus thin or thick?
- Thick
- 100.0%
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- [...] is the fertilization of a single ovum by several spermatozoa.
- Polyspermy
- 100.0%
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- What is another name for the oviducts?
- Fallopian tubes
- 100.0%
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- In the absence of ovulation, what happens to the spermatozoa in the oviduct?
- Bind to epithelial cells at the isthmus and become immotile
- 100.0%
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- In the presence of ovulation, what happens to the spermatozoa in the oviduct?
- Travel to the site of potential fertilization at the ampullary-isthmic junction
- 100.0%
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- Where in the Fallopian tubes does fertilization normally occur?
- Ampullary-isthmic junction
- 100.0%
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- Capacitation is an activation of spermatozoa triggered by the influx of [...] ions.
- Ca2+
- 100.0%
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- Which 2° messenger is increased in spermatozoal capacitation?
- cAMP
- 100.0%
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- Where does the Ca2+ which triggers spermatozoal capacitation come from?
- Uterus
- 100.0%
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- What happens to the cholesterol stores of the spermatozoon when it goes through capacitation?
- Loss
- 100.0%
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- What happens to the coating of glycoproteins on the spermatozoon when it goes through capacitation?
- Loss
- 100.0%
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- The [...] is the process that the spermatozoon goes through when it contacts the zona pellucida of the oocyte, facilitating penetration.
- acrosome reaction
- 100.0%
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- The acrosome reaction is triggered around the spermatozoon interacting with the [...] protein on the zona pellucida of the oocyte.
- ZP3
- 100.0%
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- The acrosome reaction exposes the inner acrosomal membrane of the spermatozoon, on which are located [...] enzymes which digest a path through the zona pellucida of the oocyte.
- proteolytic
- 100.0%
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- What does the proteolytic enzymes expressed on the inner acrosomal membrane of the spermatozoon do to the oocyte?
- Digest a path through the zona pellucida of the oocyte
- 100.0%
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- Once the spermatozoon has fused with the oocyte, there are several spikes of [...] ion entry into the oocyte.
- Ca2+
- 100.0%
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- Once it had been fertilized, an oocyte is called a [...].
- zygote
- 100.0%
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- An oocyte is fertilized while it is arrested around the [...]phase of its [...] m[...]tic division.
- meta, 2nd, eio
- 100.0%
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- Ca2+ entry into the oocyte after fertilization triggers the release of [...] which prevent polyspermy.
- cortical granules
- 100.0%
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- What happens to the male pronucleus after fertilization (2)?
- Chromatin decondenses and protamines are replaced by histones
- 100.0%
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- Where in the male genital tract do spermatozoa finish maturing?
- Epididymis
- 100.0%
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- Spermatozoal maturation in the epididymis is dependent on which hormones?
- Androgens
- 100.0%
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- Through which 2 fluids do androgens arrive in the epididymis?
- Via lymph and testicular fluid
- 100.0%
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- Where in the body is seminal fluid produced?
- Prostate
- 100.0%
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- What are the 2 components of semen?
- Seminal fluid and spermatozoa
- 100.0%
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- The level of which subunit of hCG is measured to verify a pregnancy and why?
- β because it is unique to hCG while α subunit is shared with LH, FSH, and TSH
- 100.0%
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- Which organism in the vagina causes its pH to become acidic?
- Lactobacilli
- 0.0%
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- What are some reducing agents contained in semen?
- Ascorbic acid, hypotaurine, ergothionine
- 0.0%
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- Coagulated semen in the female tract will dissolve within [...] minutes.
- 60
- 0.0%
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- Ejaculate is generally [...] ml.
- 5
- 0.0%
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- In normal semen, spermatozoa density should be >[...] sperm/mL.
- 15*10^6
- 0.0%
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- What is the swimming speed of spermatozoa?
- 5 mm/min
- 0.0%
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- What is a characteristic of cervical mucus which is conducive to fertilization that can be observed microscopically?
- Ferns on drying
- 0.0%
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- What does the ovum release to prevent polyspermy?
- Cortical granules
- 0.0%
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- What are 3 other names for the Fallopian tubes?
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Oviducts
Uterine tubes
Salpinges - 0.0%
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- [...] is an activation of spermatozoa triggered by Ca2+ influx which occurs about 4 hours after ejaculation.
- Capacitation
- 0.0%
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- What are the 2 distinguishing characteristics of a capacitated spermatozoon?
- Hyperactivated motility and responsiveness to signals from the oocyte
- 0.0%
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- Once the spermatozoon have digested a path through the zona pellucida, it undergoes [...] and [...] with the oocyte.
- binding, fusion
- 0.0%
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- Which organelle does the spermatozoon contribute to the zygote?
- Centrioles
- 0.0%
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- Which organelles does the oocyte contribute to the zygote?
- All but centrioles
- 0.0%
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- [...], the coming together of the gametic chromosomes, is the final phase of fertilization.
- Syngamy
- 0.0%
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