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Together, the urinary system and the reproductive
system, form |
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a system called the genitourinary system. Without
this system |
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of the human body, you could not reproduce or even go
to the |
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bathroom! But how does the genitourinary system work,
and |
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what does it do? |
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The urinary system begins when blood enters the
kidneys |
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from the renal vein. There are two kidneys, one on
each side. |
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There is also two renal veins and two renal arteries.
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one thousandth of the volume of the blood is changed
into urine |
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and sent down the ureter. The blood that is not
turned into |
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urine is sent back into circulation via the renal
arteries. |
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About 425 gallons of blood are sent through your
kidneys |
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every day! The urine that goes down the ureters ends
up in the |
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bladder. The bladder stores the urine until it is
nessasary to |
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send it to the urethra to leave your body. |
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The Male
Reproductive System |
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New lives are created using the reproductive system,
a group |
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of organs. This system is different in males and
females. |
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Both male and female systems are needed to create a
baby. |
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In the male reproductive system, sperm cells are
produced |
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in the testes. Millions of sperm cells are ejected
through |
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the urethra, but only one sperm cell fertilizes the
egg. |
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Besides producing sperm cells, the testes produce
male |
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hormones called androgens. When a boy becomes a man,
the |
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androgens allow him to grow a beard and have a deeper |
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voice. |
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The Female
Reproductive System |
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The sperm cells generated from the man enter the
woman |
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through an opening called the cervix. The sperm cell
then |
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goes into the uterus and then down the fallopian
tubes. |
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The sperm cell and the ovum combine into something |
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called a zygote. At this point, the woman has become
pregnant. |
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The zygote splits and creates lots of cells. These
cells continue |
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to split and eventually grow into a fetus in
the uterus. This |
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develops into a baby. |
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