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Kapillärer

Kapillærer are a fundamental component of the human circulatory system, consisting of extremely fine blood vessels that play a vital role in the exchange of nutrients and waste products between the bloodstream and tissues. These vessels are characterized by their thin walls, which are composed of a single layer of endothelial cells. As a result, they allow for the efficient passage of glucose, oxygen, and nutrients from the bloodstream to the tissues, while also facilitating the return of waste products and carbon dioxide to the blood.

Capillaries vary in length and diameter, but are generally the smallest of all blood vessels. In the

The function of capillaries is closely tied to the underlying tissue architecture, with the blood vessel density

human
body,
capillaries
have
an
average
diameter
of
around
5-10
micrometers
and
are
the
most
abundant
type
of
blood
vessel,
with
estimates
suggesting
that
the
total
length
of
capillaries
is
around
50,000
miles
(80,000
kilometers).
The
presence
of
capillaries
in
tissues
is
often
indicative
of
high
metabolic
activity,
as
they
enable
the
efficient
delivery
of
oxygen
and
nutrients
to
cells.
and
diameter
often
reflecting
the
degree
of
tissue
activity.
In
regions
where
metabolism
is
high,
such
as
the
liver,
intestine,
and
muscles,
capillaries
are
highly
concentrated
and
closely
packed,
facilitating
the
rapid
exchange
of
substances
between
the
bloodstream
and
cells.
In
areas
of
low
metabolic
activity,
such
as
skin
and
bone,
capillaries
are
less
dense
and
have
thicker
walls,
reducing
the
rate
of
exchange.