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