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and that brings us to the next chapter in our review of the story of
reproduction the structure and function
up the male reproductive organs
the external male reproductive organs as shown in this drawing
consisted the *** and the ***
the *** contains the testicles
in a section view weakens the that the *** and testicles are connected by
a long tube
this is the urethral canal
it expands from the *** back past the prostate gland
and seminal vesicles to join the tube leading from the testicles
in the same diagram we can
see also the bladder which empties into the urethral canal
the testicles comment correspond to the ovaries in women because they both are gland in which the
reproductive element are formed
if we examine a section of the tactical
we find that it is composed of small compartments filled with two kind cells
one kind produces un internal secretion which is carried in the blood
and result in the development have male characteristics
such as skin beard voice and body structure
the second are lining cells are constantly being changed into spermatozoa
spermatozoa are the male sex sells
this spermatozoa or *** cells are microscopic single-cell
which are propelled by the lashing motion up their long tail
like the old one more egg up a female each *** cell contains all the
hereditary characteristics
which are passed from the father to the child
spermatozoa are constantly being formed in the testicles and are stored in the massive curled tube seen here
if not empty during *** intercourse they are periodically and eat during sleep
in nocturnal emissions are wet dreams wet dreams are a perfectly normal body function
which is nature's way of getting rid of stored up ***
therefore the common belief that intercourse or *** are
necessary to relieve the pressure of stored up ***
is absolutely not true
millions spermatozoa are stored ready for ***
during intercourse the *** is in a state of *** this is caused by the spongy tissue the ***
becoming engorged with blood
the *** passes up through the duct where fluids from the glands
are added to form the ***
the *** and then flown through the urethral canal
and is deposited into the female ***
we return now to the female organs with the egg slowly moving through the tube
male *** are deposited at the upper end a ***
near the *** they begin moving up into the uterus
star may remain active here for several days
the *** move into the tubes and approach to the egg
a in this diagram both the egg
and the spermatozoa are greatly enlarged in proportion to the size of the organs
shown
normally fertilization takes place
while the egg is in the tube you here we can see this fertilization in closer view
after one spermatozoa enters the egg
no other matter
the tail drops off
the nuclei of *** and egg merge and the development began
the fertilized egg
developed by for splitting into two then in to 4
8
and so on
and so on
and a single spermatozoa the child develop
these early division take place while the fertilized egg is still moving
through the tube
as you may recall the uterine wall has during this part of the menstrual cycle
been preparing to receive this day
the wall is rich with blood and lymph from which the growing organism will
grow its nourishment
nesting to be a good against the uterine wall brings about many glandular action
these first causes taxation of *** and then
during the course of the egg development into a baby produce the many secondary
physical and physiological characteristics of a pregnancy
after the first two weeks this fertilized egg
enter the embryo stage
the embryo itself lies along the inner margin of the yolk sac
and is in turn connected by a stock to the membrane through which
food will be absorbed
at this time the embryo is still almost microscopic in size
but the largest portion is the yolk sac which provide
early nourishment
the development of the embryo is an interesting and highly complex process
during the first four weeks the embryo increases rapidly in size
the yolk sac becomes progressively smaller
as it is absorb but the mechanism for feeding from the mother
has in the meantime been developed
after forth week but have appeared where the limbs will develop
and the embryo has now taken definite form
during the next Month limbs as you more specific shape and the head becomes
large as the brain develops
the fetus as it is now called resembles most other mammals at a similar stage of grows