Upgrade to remove ads
"Life's Greatest Miracle"
Terms in this set (56)
How many babies are born each day?
How many cells make up our bodies?
What characteristic of DNA makes it a particularly good molecule for inheritance?
the ability to make copies of itself
What would be one disadvantage of all humans (or other organisms) being genetically identical?
one disease could wipe out the whole earth
What proportion of organisms more complex that bacteria conduct some form of sexual reproduction?
Where there's sex, there is
The tube constituting the internal structure of the human testicle, if stretched out, would be about how long?
How many sperm are produced per second in the human?
Sperm per day
Sperm per lifetime
How many genes in each cell of your body?
The value of sexual reproduction is...
variety for offspring
When did the wife in the video produce her eggs?
in the womb
At the age of 31, how many viable eggs might the wife have?
a few thousand
The "portal" to the uterus is the
Is there a direct connection between the ovary and the fallopian tube?
How long does an egg have to be fertilized?
a few hours
The fluid released by a male at the time of sexual intercourse contains about how many sperm?
What is the first challenge to the sperm?
What proportion of sperm are likely to be imperfect in healthy man?
What happens to the cervix at the time of ovulation?
How long will it take sperm to reach the fallopian tube?
In order for a sperm to fertilize the egg, it's outer membrane must be altered. Where does that occur?
The thick protein shell of an egg is called the...
How does the sperm penetrate the zona?
proteins hook up and release enzymes
What proportion of fertilized eggs may never develop?
The first even after fertilization is
it orders the zone to block out all other sperm
How long after sperm enters egg does the first division of the zygote occur?
Where is the egg when fertilization and the first few cell divisions occur?
moving down the fallopian tube
How long does it take for the developing embryo to reach the uterus?
What prevents the blastocyst from being consumed by WBC'S?
produces chemicals that suppress the immune system of the mother
When does the actual embryo form by gastrulation?
The beginning of the nervous system is called the
4 and 1/2 weeks after fertilization, the embryo is about how long?
Cell differentiation occurs by...
cells talking to each other, location
If all the DNA in a cell was stretched out, it would be....
6 feet long
The embryonic structures that mature into either ovaries or testicles are called...
How many genes are there on the Y chromosomes?
Late in the 6th week of development, what gene on the Y chromosome may turn on to cause development of the embryo into a boy?
How long is the SRY gene active?
a day or two
If testicles develop, the hormone they produce is called
How long after fertilization before the embryo is called a fetus?
The fetus at 2 months is about...
1 in long and weighs about 1/3 of an ounce
The mothers blood is scavenged for nutrients to support the fetus by a structure called the
The projections on the placenta that increase surface area are called
The umbilical cord is about how long?
1 and 1/2 feet
The first fetal organ to start working is the
How old is the fetus when it responds to light?
5 or 6 months
Hard bone begins to form by what month?
the 4th month
When do the hard bones of the ear form so that the fetus can hear sounds?
The fetus's main job during this period is
What is being produced in the brain to increase brain power?
How much has the mother's blood supply increased during pregnancy?
How large does the cervical opening need to be to permit birth?
Why are humans the only mammalian species to have others present during birth?
they are far more dangerous in comparison
What was the most interesting thing you learned or that stuck you most powerfully in this video?
That is isn't until the 5th month that the baby can hear sounds
This set is often in folders with...
You might also like...
In the Womb Review
Psyche 41: Chapter 3
Life's greatest miracle
Anatomy practical NOVA life's greatest Miracle
Other sets by this creator
TeXes 154 ESL Review Course Workshop
ESL 154 Prep Guide #2
Summaries of ELPS: Proficiency Standards
ESL 154 Prep Guide #1
Other Quizlet sets
gringos menu test
6.2 Classifying the elements
DWELLING - MODULE B
Coordinate Systems Exam 1