Card Set Information
Baby Reproductive Anatomy
Life's Greatest Miracle
Our bodies want to make ________.
Around the world, about ________ new babies get made every day.
From a _______ ____, you built a body that has 100 trillion cells.
At least some blame for the urge to reproduce can go to this...._____.
If humans were all clones, we'd have the exact same ______ ______ and one successful parasite could wipe us all out. Fortunately, there's ____.
immune system, sex
When there's sex, there's ________ and when it comes to survival of the fittest, ______ has a definite advantage.
The tubes in the testes can stretch out to cover ___________. What are they called?
half a mile, semineferous tubules
A man can produce ______ new sperm every second, 100 million every day, 2 trillion over a lifetime.
Each sperm is carrying a unique ______ package.
How does this genetic activity happen? By a process called _______.
We have _______ genes spread out over 46 chromosomes.
The more _______, the better the odds are that someone will survive to create a new generation.
Melinda created _______________ when she was a fetus in her mother's womb.
all of her eggs
At the age of 31, she may only have a few __________ eggs left.
The egg is swept along the felopian tube by muscular contraction and the action of ______.
If the egg is not fertilized within a few _____, it will die.
The sperm travel along a ___ inch tube looping into the abdomen and penis.
The semen is only about a teaspoon but contains ____ million sperm.
Even in a healthy man, ___% of sperm are less than perfect.
For a few days a month around ovulation, the mucus plug over the cervix becomes ______.
It is estimated that ____% of all fertilized eggs fail to develop.
About 5 days after fertilization, the dividing cells arrive in ______, about 100 small cells trapped within the zona.
The Blastocyst burrows into the uterine lining searching for ______________.
food and oxygen
2 weeks after conception, the blastocyst is the size of a _________.
Gastrulation is the process of the blastocyst changing into an _______.
3 weeks after fertilization, the embryo is less than a ___th of an inch.
At 4.5 weeks the embryo is 1/5 of an inch long, has a ___, a large developing brain and eye.
If all DNA in a single cell were unwound, it would be __ft long.
At 7 weeks old, boy and girl embryos look ________, inside and out.
A gene on the Y chromosome called ____ turns on for a day or two setting off a chain of events leading to testes.
2 months after fertilization, the embryo now called a _____, is just over an inch and less than a third of an ounce.
The Placenta's underside has 1000's of _____ which lie in pools of the mom's blood.
(true/false) The mother's blood normally never mixes with the blood of the fetus.
The fetus's heart beasts _____ as fast as adults.
Most of the bones in the fetus start as __________.
After 5 months the fetus can ____.
At week 8 the fetus is ___ inch long with fingers and toes. At 12 weeks it is 3 inches, at 16 weeks it is 5 inches.
During the last __________, all organs are in place and they mostly need to grow.
During the 6th month, genes order the manufacture of a fatty covering for the neurons called _______.
Human births are far more dangerous due to the brain being 3x larger than other primates and humans have a ______ pelvis for walking.