BIOM 3200: Reproduction System Practice
Questions With Complete Answers
A surge of which hormone is necessary for ovulation? - ANSWER LH
How many days before ovulation does LH spike? - ANSWER 2 days
Which hormone(s) spike 2 days before ovulation? - ANSWER LH & FSH
What factor does LH increase by for ovulation to occur? - ANSWER 6-10x
What factor does FSH increase by for ovulation to occur? - ANSWER 2-3x
What does the surge in LH for ovulation do? - ANSWER converts granulosa and
theca cells to progesterone-producing cells
What is the transport time of ova in the Fallopian tube of humans? - ANSWER 72
hrs
How long can a sperm survive in the female reproductive tract? - ANSWER 3
days
At what point in the female reproductive cycle can fertilization occur? - ANSWER
up to a day after ovulation
Is it possible for a female to get pregnant if intercourse occurs prior to
ovulation? - ANSWER Yes, because sperm can survive up to 3 days in the female
reproductive tract.
How long can a secondary oocyte survive after ovulation? - ANSWER 12-24 hrs
How many sperm would a fertile male human produce in 2-6 mL of ejaculate? -
ANSWER 40-120 million sperm
Where is seminal fluid produced? - ANSWER 60% from seminal vesicles
30% from prostate
What is the pH of ejaculate? - ANSWER 7 - 8.3
Where does fertilization usually occur? - ANSWER Fallopian tubes
The outermost layer surrounding the egg that sperm have to penetrate is called
the...? - ANSWER corona radiata
, The innermost layer around the egg that sperm have to penetrate is called the...
? - ANSWER zona pellucida
How is polyspermy prevented in mammals? - ANSWER formation of a secreted
chemical barrier
How is polyspermy prevented in frogs, clams, and marine worms? - ANSWER
electrical barrier
If day 01 is fertilization, what takes place during days 2-4? - ANSWER cell
division as zygote moves through oviduct to uterus
Day 1 is fertilization. What day does the blastocyst reach the uterus? - ANSWER
day 4-5
How many cells are in the blastocyst when it reaches the uterus? - ANSWER 100
Day 1 is fertilization. When does implantation occur? - ANSWER day 5-9
How many cells are in a morula? - ANSWER 12-16 cells
What is nidation? - ANSWER implantation of the blastocyst
Which cells produce the enzyme that allows the blastocyst to implant in the
endometrium? - ANSWER trophoblast cells
What do trophoblast cells do? - ANSWER they produce enzymes that allow the
blastocyst to "eat" its way into the endometrium for implantation.
They also secrete hCG to maintain the mother's corpus luteum (produces
progesterone until the placenta takes over).
______ % of lost pregnancies are due to failure of implantation. - ANSWER 75%
What is an ectopic pregnancy? - ANSWER a pregnancy in which implantation
occurs somewhere other than the posterior wall of the uterine cavity.
What percent of pregnancies are ectopic? - ANSWER 0.25% - 1.0%
What is placental previa? - ANSWER When the blastocyst implants too close to
the cervix, resulting in the placenta blocking the cervical canal.
How many weeks into pregnancy does hCG peak? - ANSWER 10 weeks
How do pregnancy tests work? - ANSWER Pregnancy tests are immunoassays.
There are three antibodies present in the test.
Questions With Complete Answers
A surge of which hormone is necessary for ovulation? - ANSWER LH
How many days before ovulation does LH spike? - ANSWER 2 days
Which hormone(s) spike 2 days before ovulation? - ANSWER LH & FSH
What factor does LH increase by for ovulation to occur? - ANSWER 6-10x
What factor does FSH increase by for ovulation to occur? - ANSWER 2-3x
What does the surge in LH for ovulation do? - ANSWER converts granulosa and
theca cells to progesterone-producing cells
What is the transport time of ova in the Fallopian tube of humans? - ANSWER 72
hrs
How long can a sperm survive in the female reproductive tract? - ANSWER 3
days
At what point in the female reproductive cycle can fertilization occur? - ANSWER
up to a day after ovulation
Is it possible for a female to get pregnant if intercourse occurs prior to
ovulation? - ANSWER Yes, because sperm can survive up to 3 days in the female
reproductive tract.
How long can a secondary oocyte survive after ovulation? - ANSWER 12-24 hrs
How many sperm would a fertile male human produce in 2-6 mL of ejaculate? -
ANSWER 40-120 million sperm
Where is seminal fluid produced? - ANSWER 60% from seminal vesicles
30% from prostate
What is the pH of ejaculate? - ANSWER 7 - 8.3
Where does fertilization usually occur? - ANSWER Fallopian tubes
The outermost layer surrounding the egg that sperm have to penetrate is called
the...? - ANSWER corona radiata
, The innermost layer around the egg that sperm have to penetrate is called the...
? - ANSWER zona pellucida
How is polyspermy prevented in mammals? - ANSWER formation of a secreted
chemical barrier
How is polyspermy prevented in frogs, clams, and marine worms? - ANSWER
electrical barrier
If day 01 is fertilization, what takes place during days 2-4? - ANSWER cell
division as zygote moves through oviduct to uterus
Day 1 is fertilization. What day does the blastocyst reach the uterus? - ANSWER
day 4-5
How many cells are in the blastocyst when it reaches the uterus? - ANSWER 100
Day 1 is fertilization. When does implantation occur? - ANSWER day 5-9
How many cells are in a morula? - ANSWER 12-16 cells
What is nidation? - ANSWER implantation of the blastocyst
Which cells produce the enzyme that allows the blastocyst to implant in the
endometrium? - ANSWER trophoblast cells
What do trophoblast cells do? - ANSWER they produce enzymes that allow the
blastocyst to "eat" its way into the endometrium for implantation.
They also secrete hCG to maintain the mother's corpus luteum (produces
progesterone until the placenta takes over).
______ % of lost pregnancies are due to failure of implantation. - ANSWER 75%
What is an ectopic pregnancy? - ANSWER a pregnancy in which implantation
occurs somewhere other than the posterior wall of the uterine cavity.
What percent of pregnancies are ectopic? - ANSWER 0.25% - 1.0%
What is placental previa? - ANSWER When the blastocyst implants too close to
the cervix, resulting in the placenta blocking the cervical canal.
How many weeks into pregnancy does hCG peak? - ANSWER 10 weeks
How do pregnancy tests work? - ANSWER Pregnancy tests are immunoassays.
There are three antibodies present in the test.
