Iron County register. [volume] (Ironton, Iron County, Mo.) 1867-1965, 1884-08-14
The Capillary system.

/ Commercial Bulletin. s8@aa5
The Capillary system.
The arteries distribute blood to every
| portion of the body. They ultimately
become infinitely small and then re-
ceive the name of capiilaries, Lecause
they are as small as the finest ma rs.
Still blood passes Though them and is
by them distributed to nearly every
point of all the tissues. AS they pass
| through the several tissues, they deliv-
er to these tissues atoms of nutritious
i matter, by which the tissues are made
to enlar e and grow. Not only do the
! capillaries deliver blood to all the It's
sues, but such tissue has the power to
seize the kind of particles it needs to
promote its growth and to reject those
particles it does not need. The capil-
laries that enter the periosteum of the
bones yield to them the atoms that
build bones. The capillares that en-
| ter the muscles yield thoss particles of
which muscles are composed. Each
tissue selects from the contents of the
capjllaries those particles in the blood
that promote its growth and strength.
The value of the blood depends upon
the food from which it has been made.
Not only food contributes to the value
of the vital fluid, but the oxygen of the
air that the lungs may inhale, or that
the skin and mucous membrane may
absorb. In some former essays we
+ have shown how food. animal and
vegetable, is changed to blood Exercise
increases the action OF the heart and so
augments the amount of blood that
passes through it. Increasing the ac-
ton of the heart increases the action Of
the lungs, and so increases the amount
of air inhaled, and augments the rich
ness and quantity of the blood that
passes through the capillaries and the
nutritious particles that are de-
posted in the several tissues. Food,
then, should contain the particles of
matter each tissue needs. We give
hogs corn because corn contains fat.
We may give them oat meal to supply
the need of particles. These capillaries
are thin, and delicate and still pene.
trate among the cells and fibers of the
various organs. They are unlike other
blood tubes in that they constantly
unite and communicate tn each
other, and SO form the capillary net
work. resembling net, made of tubes.
Through these muscles of tubes the
blood moves steadily and necessarily
loses its oxygen, and yields its PARTICLES
OF nutritious matter. and changes from
arterial to venous or enters the veins
and returns to the left side of the heart.
But the nutrit Gus particles in these
arterial capillaries are soon exhausted,
and these continue to convey the ex-
hausted blood by capiliaries that as
sumo a different name, because they
assume a diserent duty. They now
convey spent blood towards the veins,
and so are called venous capillaries.
In the capillaries then, the arterial
blood Lecomes venous, enters the veins,
and flows onward and enters the right
auricle of the heart.
Veins run very near the surface and
arteries run deeper. So the veins are
more liable to be compressed than the
arteries. Clothing closely fitted to the
surface of the body congresses the
veins more or less. and SO checks the
free circulation of the blood. 1t does
not stop it, because veins communicate
with each other by lateral branches,
and then at many points they have
valves. that prevent the blood from be-
ing compelled to return to the capillar-
stopped in one spot it will find its
way to the right auricle of the heart
by some other veins. We can stop the
venous currents only by checking or
stopping the blood entirely. that
may be done by firmly enclrcling the
limb or body with simultaneous
pressure Tight clothing is always more
or less injurious. Moderate pressure
anu Soofion pf tho lin, LS <l,. br,1,y
checks more or less the circulation of
venous blood. A cord slightly COM
pressing the entire limb checks or stops
the circulation of venous blood of the
limb, and SO checks the free movement
of the blood through the limb COM
pressed. Below the compression the
parts swell and lose their supply of nu-
nition- And so if the compression be
continued for any length of time, the
limb or other part viii be injured. The
muir ton of it's tissues will be prevented
and the limb will lose its strength and
cease to grow. Any pressure upon any
part of the limb or body. will check the
,circu alton of the venous blood and so
diminish the usual rapidity of growth.
In no way, then, should pressure upon
the limbs or body be allowed in the
young and growing. The arteries
should be unobsJru ted in their course,
the capillaries should convey blood in q
full supply to nourish all the tissues.
and then the veins should be free to
convey spent blood from the capiilaries
to the right auri lie of the heart Let
every organ of the animal circulation
be free to re- Give the amount of nour-
ishment it needs. and then be equally
FRO, fo remove ifs waste material nv tho
veins.
The circulation of the blood is much
more rapid than many may suppose.
In healthy human beings the blood cir
culates through the arteries, capilla-
ries, veins and lungs in tn rty seconds.
1t makes two circulat.ons in minute,
or the healthy human blood hurries
through the arteries, traverses the cap
Hilary meshes passes through the veins,
enters the heart, passes to the outer sur
face Of the pulmonary air cells, returns
to the LETT auricle and right ventric of
the heart, 1870 times in an hour, or
nearly 5000 times in twenty-four hours,
or over ], 900, 800 times a year, 80 that
every circulation the blood may make
it deposits sources of nutrition, and re-
moves waste rom the system in a won
derfully short period of time. These
facts show how rapidly tissue changes
may occur, how soon deficient respira-
ton may induce impurity in the blood.
and how much harm a check to the free
motion of the blood may do. II
44lten. in Western Rarai.
A thestrical manager, about to pro-
duce a. specf acuiar piece SAYS that a