17971060
Beschreibung
Quiz von Trent McNutt, aktualisiert more than 1 year ago
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Erstellt von Trent McNutt
vor etwa 5 Jahre
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Frage 1
Frage
What is the purpose of white blood cells within the FRT?
Antworten
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Spermatozoa are foreign to the female reproductive tract. Some are attacked by white blood cells.
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None.
Frage 2
Frage
What is one benefit and one challenge that is a result of these white blood cells being in the female reproductive tract?
Antworten
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Non-motile and abnormal spermatozoa are removed (benefit)
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Other normal cells may be removed (challenge)
Frage 3
Frage
What is capacitation?
Antworten
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The biochemical change to sperm that allows the true acrosome reaction to occur
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None
Frage 4
Frage
How does capacitation alter sperm motility?
Antworten
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Change in tail motility (hyper-activation)
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None
Frage 5
Frage
Fertilization can occur without capacitation.
Antworten
- True
- False
Frage 6
Frage
What is the primary purpose of the acrosomal reaction?
Antworten
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Fusion of sperm plasma membrane and outer acrosomal membrane
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None
Frage 7
Frage
What is “vesiculation”?
Antworten
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Pores develop at point of fusion and enzymes in the acrosome can be released
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None.
Frage 8
Frage
How does the nucleus of the sperm change once the sperm is engulfed by the oocyte?
Antworten
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Decondenses
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None
Frage 9
Antworten
-
Zona pellucida
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None
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Perivitelline space
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None
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Oocyte nucleus
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None
Frage 10
Antworten
-
ootid
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None
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Zygote
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None
-
Two-celled stage
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None
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Four-celled stage
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None
Frage 11
Frage
What is the function of the allantois?
Antworten
-
Carries blood vessels of placenta
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None
Frage 12
Frage
What is the function of the amnion?
Antworten
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Protects fetus from injury, provides lubrication for parturition, reservoir for urine and wastes
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None
Frage 13
Frage
Maternal recognition of pregnancy is necessary in many species to prevent pregnancy loss caused by what irreversible event?
Antworten
-
Luteolysis
-
None
Frage 14
Frage
In order for maternal recognition of pregnancy to occur in the ewe/cow, what (if anything) is secreted by the conceptus to signal its presence
Antworten
-
Interferon Tau
-
None
Frage 15
Frage
How does the presence of the conceptus affect PGF2α production?
Antworten
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Protects CL by preventing PGFRa pulses.
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None
Frage 16
Frage
In order for maternal recognition of pregnancy to occur in sows, what (if anything) is secreted by the conceptus to signal its presence?
Antworten
-
Estrogen
-
None
Frage 17
Frage
How does the presence of the conceptus affect PGF2α production in sows?
Antworten
-
Estradiol does not inhibit PGF2a but causes it to be rerouted -> away from submucosal capillaries (for countercurrent exchange transport)
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None
Frage 18
Frage
In order for maternal recognition of pregnancy to occur in mares, what must happen?
Antworten
-
Embryo must migrate between horns from days 12 – 17 of gestation
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Presence of the conceptus prevents Luteolysis -> reduces endometrial production of PGF2a
Frage 19
Frage
Complete the table below to indicate the correct classification of placenta for each species. The dog is provided as an example
Antworten
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Epitheliochorial
-
Epitheliochorial also
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Hemochorial
-
Epitheliochorial again
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Diffuse
-
Diffuse also
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Cotyledonary
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Discoid
Frage 20
Frage
Describe the main characteristics of a diffuse placenta type.
Antworten
-
Uniform distribution of chorionic villi
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Initial attachment occurs around day 12 of gestation and is well established by day 18 – 20 after fertilization
Frage 21
Frage
How does the zonary placenta type differ from the diffuse placenta type?
Antworten
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Has prominent exchange region (chorionic villi) that forms a zone near the middle of the conceptus
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None
Frage 22
Frage
The placental unit of trophoblastic origin consisting of abundant blood vessels and connective tissue, found in ruminants, is called:
Antworten
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Cotyledon
-
None
Frage 23
Frage
Although mares, sows, and ruminants (ex: cows) all have epitheliochorial placentas, the placenta of the cow is different compared to the sow and mare. What are 2 differences?
Antworten
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Caruncles/Endometrial folds
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None
Frage 24
Frage
When classifying placentas based on level of intimacy/number of tissue layers, what type would have 6 layers?
Antworten
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Epitheliochorial
-
None
Frage 25
Frage
Which is the “most intimate placenta type”?
Antworten
-
Hemochorial
-
None
Frage 26
Frage
The fetus triggers the onset of parturition by secreting [blank_start]cortisol[blank_end].
Antworten
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cortisol
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None
Frage 27
Frage
What 3 hormones contribute to myometrial contractions during parturition?
Antworten
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Oxytocin
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Estrogen
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PGF2a
Frage 28
Frage
Which hormone is released as a consequence of pressure on the cervix?
Antworten
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Oxytocin
-
None
Frage 29
Frage
Which hormone allows for loosening/widening of the birth canal to allow for parturition?
Antworten
-
Relaxin
-
None
Frage 30
Frage
What is dystocia?
Antworten
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trouble giving birth
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None
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